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Guide","2025-12-26",{"featured_image":491,"url":497,"title":498,"updated_at":499},{"id":36,"alt":492,"path":36,"large":494,"original":495,"user_context":496},{"au":493,"ca":493,"de":493,"en":493,"fr":493,"nl":493,"nz":493,"uk":493,"us":493},"A massive, dense cannabis cola bending under its own weight, illuminated by warm grow lights, with a blurred background of a thriving indoor garden.","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fheavy-harvest-ready-colas.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fheavy-harvest-ready-colas.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fuk\u002Fblog\u002Ffast-flowering-cannabis-for-multiple-harvests","Top 5 Fast-Flowering Cannabis Strains Perfect for Multiple Harvests Per Year","2025-12-05",{"featured_image":501,"url":507,"title":508,"updated_at":509},{"id":36,"alt":502,"path":36,"large":504,"original":505,"user_context":506},{"au":503,"ca":503,"de":503,"en":503,"fr":503,"nl":503,"nz":503,"uk":503,"us":503},"Glass mason jars filled with cured cannabis buds on a wooden table next to trimming scissors, representing a high-yield harvest from fast-flowering feminized seeds","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fthe-bountiful-harvest.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fthe-bountiful-harvest.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fuk\u002Fblog\u002F7-fastest-feminised-cannabis-strains-for-quick-harvests","7 Fastest feminised Cannabis Strains for Quick Harvests","2025-11-27",{"featured_image":511,"url":520,"title":521,"updated_at":522},{"id":36,"alt":512,"path":36,"large":517,"original":518,"user_context":519},{"au":513,"ca":513,"de":514,"en":513,"fr":515,"nl":516,"nz":513,"uk":513,"us":513},"8 Easy Photoperiod Cannabis Strains for Beginner Growers","8 Einfache Photoperioden-Cannabis-Sorten für Anfänger 🌱","8 Variétés Photopériode Faciles pour Cultivateurs Débutants","8 Makkelijke Fotoperiode Cannabis Strains voor Beginners","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Ftop-8-easiest-photoperiod-cannabis-strains-for-beginner-growers.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Ftop-8-easiest-photoperiod-cannabis-strains-for-beginner-growers.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fuk\u002Fblog\u002Ftop-7-easiest-photoperiod-cannabis-strains-for-beginner-growers","Top 7 Easiest Photoperiod Cannabis Strains for Beginner Growers","2025-10-29",{"featured_image":524,"url":533,"title":534,"updated_at":535},{"id":36,"alt":525,"path":36,"large":530,"original":531,"user_context":532},{"au":526,"ca":526,"de":527,"en":526,"fr":528,"nl":529,"nz":526,"uk":526,"us":526},"9 Best Sativa Strains for Daytime Energy, Focus & Creativity","9 Beste Sativa-Sorten für Energie, Fokus & Kreativität am Tag","9 Meilleures Variétés Sativa pour Énergie, Focus & Créativité","9 Beste Sativa Strains voor Energie, Focus & Creativiteit overdag","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Ftop-8-energizing-sativa-strains-perfect-for-daytime-use-and-creativity.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Ftop-8-energizing-sativa-strains-perfect-for-daytime-use-and-creativity.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fuk\u002Fblog\u002Ftop-8-energizing-sativa-strains-perfect-for-daytime-use-and-creativity","Top 8 Energizing Sativa Strains Perfect for Daytime Use and Creativity","2025-10-22",{"title":537,"key":538,"entity":415,"items":539},"Latest Posts","latest_posts",[540,554,568,581,594],{"featured_image":541,"url":551,"title":552,"updated_at":553},{"id":542,"path":543,"original":544,"large":545,"alt":546},"5101",{"original":544,"large":545},"https:\u002F\u002Fapi.weedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fgrow-diary-sour-diesel.webp","https:\u002F\u002Fapi.weedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fgrow-diary-sour-diesel.webp",{"en":547,"de":548,"nl":549,"fr":550,"ca":547,"us":547,"uk":547,"au":547,"nz":547},"Sour Diesel Photoperiod Grow Diary Week by Week","Sour Diesel Photoperiod Grow-Tagebuch Woche für Woche","Sour Diesel Photoperiod kweekdagboek week per week","Sour Diesel photopériodique : journal semaine par semaine","\u002Fuk\u002Fblog\u002Fsour-diesel-week-by-week-grow-diary-strain-review","Sour Diesel – Week by Week Grow Diary & Strain Review","2026-09-11",{"featured_image":555,"url":565,"title":566,"updated_at":567},{"id":556,"path":557,"original":558,"large":559,"alt":560},"5072",{"original":558,"large":559},"https:\u002F\u002Fapi.weedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fmixing-liquid-cannabis-nutrients-measuring-guide.webp","https:\u002F\u002Fapi.weedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fmixing-liquid-cannabis-nutrients-measuring-guide.webp",{"en":561,"de":562,"nl":563,"fr":564,"ca":561,"us":561,"uk":561,"au":561,"nz":561},"A close-up, high-speed photograph of golden liquid cannabis nutrients being poured into a clear measuring beaker, with splashing droplets and healthy green cannabis leaves blurred in the background.","Eine hochauflösende Nahaufnahme eines Highspeed-Fotos, auf dem goldene flüssige Cannabis-Nährstoffe in einen transparenten Messbecher gegossen werden, mit spritzenden Tropfen und unscharfen, gesunden grünen Cannabisblättern im Hintergrund.","Een close-up high-speedfoto van goudkleurige vloeibare cannabisvoeding die in een doorzichtige maatbeker wordt gegoten, met opspattende druppels en gezonde groene cannabisbladeren wazig op de achtergrond.","Une photographie en gros plan à haute vitesse montrant des nutriments liquides de cannabis de couleur dorée versés dans un bécher doseur transparent, avec des éclaboussures et des feuilles de cannabis vertes en bonne santé floues à l’arrière-plan.","\u002Fuk\u002Fblog\u002Fultimate-guide-to-cannabis-nutrients-ec-and-water-quality","The Ultimate Guide to Cannabis Nutrients, EC, and Water Quality","2026-09-10",{"featured_image":569,"url":578,"title":579,"updated_at":580},{"id":570,"path":571,"original":572,"large":573,"alt":574},"5068",{"original":572,"large":573},"https:\u002F\u002Fapi.weedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fgrow-diary-fat-bastard.webp","https:\u002F\u002Fapi.weedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fgrow-diary-fat-bastard.webp",{"en":575,"de":576,"nl":576,"fr":577,"ca":575,"us":575,"uk":575,"au":575,"nz":575},"Fat Bastard Photoperiod Grow Diary Week by Week","Fat Bastard fotoperiode kweekdagboek week voor week","Journal de culture photopériodique Fat Bastard semaine par semaine","\u002Fuk\u002Fblog\u002Ffat-bastard-week-by-week-grow-diary-strain-review","Fat Bastard - Week by Week Grow Diary & Strain Review","2026-09-04",{"featured_image":582,"url":591,"title":592,"updated_at":593},{"id":36,"alt":583,"path":36,"large":588,"original":589,"user_context":590},{"au":584,"ca":584,"de":585,"en":584,"fr":586,"nl":587,"nz":584,"uk":584,"us":584},"A close-up of a person's palm holding a pile of mature cannabis seeds and a small green cannabis leaf, illustrating the starting point of growing home medicine and the importance of choosing between high-THC and high-CBD genetics for specific health goals.","Eine Nahaufnahme der Handfläche einer Person, die einen Haufen reifer Cannabissamen und ein kleines grünes Cannabisblatt hält, und damit den Ausgangspunkt für den Anbau von Hausmedizin sowie die Bedeutung der Wahl zwischen Genetik mit hohem THC- und hohem CBD-Gehalt für bestimmte Gesundheitsziele veranschaulicht.","Un gros plan de la paume d’une personne tenant une poignée de graines de cannabis matures et une petite feuille verte de cannabis, illustrant le point de départ de la culture de son propre médicament à domicile et l’importance de choisir entre des génétiques riches en THC et riches en CBD selon des objectifs de santé spécifiques.","Een close-up van iemands handpalm die een hoop rijpe cannabiszaden en een klein groen cannabisblad vasthoudt, waarmee het startpunt van het kweken van thuismedicatie wordt geïllustreerd en het belang van het kiezen tussen genetica met een hoog THC-gehalte en genetica met een hoog CBD-gehalte voor specifieke gezondheidsdoelen.","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fchoosing-cannabis-seeds-thc-cbd-genetics-hero.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fchoosing-cannabis-seeds-thc-cbd-genetics-hero.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fuk\u002Fblog\u002Fhigh-cbd-vs-high-thc-genetics-choosing-your-medicine","High-CBD vs. High-THC Genetics: Choosing Your Medicine","2026-08-28",{"featured_image":595,"url":604,"title":605,"updated_at":606},{"id":36,"alt":596,"path":36,"large":601,"original":602,"user_context":603},{"au":597,"ca":597,"de":598,"en":597,"fr":599,"nl":600,"nz":597,"uk":597,"us":597},"A high-end flat-lay photography shot on marble featuring a cannabis fan leaf, a blue spray bottle of colloidal silver, a pile of mature seeds, and a small glass of dried buds.","Eine hochwertige Flat-Lay-Fotografieaufnahme auf Marmor mit einem Cannabis-Fächerblatt, einer blauen Sprühflasche mit kolloidalem Silber, einem Haufen reifer Samen und einem kleinen Glas mit getrockneten Blüten.","Une photographie flat lay haut de gamme prise sur du marbre, présentant une feuille de cannabis, un flacon pulvérisateur bleu d’argent colloïdal, un tas de graines mûres et un petit verre de têtes séchées.","Een luxe flat-layfoto op marmer met een cannabiswaaierblad, een blauwe spuitfles met colloïdaal zilver, een hoopje rijpe zaden en een klein glaasje met gedroogde toppen.","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fhow-to-make-feminized-cannabis-seeds-guide.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fhow-to-make-feminized-cannabis-seeds-guide.webp",{"user_url":36,"user_name":36,"user_image":62},"\u002Fuk\u002Fblog\u002Fhow-to-make-feminised-seeds-at-home","How to Make Your Own feminised Seeds at Home","2026-08-21",{"head":608,"entity":648},{"meta_title":609,"meta_description":610,"meta_related_url":611,"canonical":612,"alternatives":613},"Autoflower Light Schedule Explained What Works Best - WSE UK","Curious to the best light schedule for autoflowers? Check this blog to choose the best light cycle for your autoflower strain.",[],"https:\u002F\u002Fweedseedsexpress.com\u002Fblog\u002Fbest-light-schedule-for-autoflowers",[614,616,620,625,630,634,638,640,644],{"url":612,"iso":10,"locale":10,"domain":615},"https:\u002F\u002Fweedseedsexpress.com",{"url":617,"iso":618,"locale":619,"domain":615},"https:\u002F\u002Fweedseedsexpress.com\u002Fde\u002Fblog\u002Fbester-lichtzyklus-fuer-autoflower","de","de-DE",{"url":621,"iso":622,"locale":623,"domain":624},"https:\u002F\u002Fweedseedsexpress.nl\u002Fblog\u002Fbeste-lichtschema-voor-autoflowers","nl","nl-NL","https:\u002F\u002Fweedseedsexpress.nl",{"url":626,"iso":627,"locale":628,"domain":629},"https:\u002F\u002Fweedseedsexpress.fr\u002Fblog\u002Fbest-calendrier-declairage-pour-autofloraisons","fr","fr-FR","https:\u002F\u002Fweedseedsexpress.fr",{"url":631,"iso":632,"locale":633,"domain":615},"https:\u002F\u002Fweedseedsexpress.com\u002Fca\u002Fblog\u002Fbest-light-schedule-for-autoflowers","ca","en-CA",{"url":635,"iso":636,"locale":637,"domain":615},"https:\u002F\u002Fweedseedsexpress.com\u002Fus\u002Fblog\u002Fbest-light-schedule-for-autoflowers","us","en-US",{"url":639,"iso":7,"locale":11,"domain":615},"https:\u002F\u002Fweedseedsexpress.com\u002Fuk\u002Fblog\u002Fbest-light-schedule-for-autoflowers",{"url":641,"iso":642,"locale":643,"domain":615},"https:\u002F\u002Fweedseedsexpress.com\u002Fau\u002Fblog\u002Fbest-light-schedule-for-autoflowers","au","en-AU",{"url":645,"iso":646,"locale":647,"domain":615},"https:\u002F\u002Fweedseedsexpress.com\u002Fnz\u002Fblog\u002Fbest-light-schedule-for-autoflowers","nz","en-NZ",{"type":415,"data":649},{"id":650,"canonical":10,"url":651,"title":652,"description":653,"clone":654,"indexed":657,"featured_image":658,"meta_title":661,"meta_description":610,"meta_keywords":36,"reading_time":662,"created_at":663,"updated_at":664,"defaultCategory":665,"categories":672,"relatedPosts":673,"author":674},262,"\u002Fuk\u002Fblog\u002Fbest-light-schedule-for-autoflowers","The Ultimate Autoflower Light Schedule Guide: Maximize Your Yields","\u003Cp>If you're staring at your timer wondering whether to run 18\u002F6, 20\u002F4, or go full send with 24\u002F0, breathe. Autoflowers don't need a 12\u002F12 flip to bloom; they flower by age, so you've got options.\u003C\u002Fp>\n\u003Cp>The trick is choosing a light schedule that fits your room, your budget, and your strain's temperament. We've trialed them all, logged the data, and grown more autos than we can count.\u003C\u002Fp>\n\u003Cp>Here's the clear, no-drama guide we wish we had on grow #1.\u003C\u002Fp>\n\u003Ch2>Key Takeaways\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>\u003Cstrong>Best All-Around Schedule:\u003C\u002Fstrong> \u003Cstrong>18\u002F6\u003C\u002Fstrong> (18 hours on, 6 off) is the gold standard. It provides the best balance of robust growth, energy efficiency, and heat management. \u003Cstrong>Start here if you're unsure.\u003C\u002Fstrong>\u003C\u002Fli>\n\u003Cli>\u003Cstrong>For Maximum Yield:\u003C\u002Fstrong> \u003Cstrong>20\u002F4\u003C\u002Fstrong> (20 hours on, 4 off) can boost growth and yield in a well-dialed environment with good genetics, but produces more heat and uses more power.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>For Cold Rooms Only:\u003C\u002Fstrong> \u003Cstrong>24\u002F0\u003C\u002Fstrong> (24 hours on) is an option only if you need the light to help heat your grow space. It can stress some plants and is the least energy-efficient.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Hours vs. Intensity:\u003C\u002Fstrong> Don't just focus on the schedule. Your light's \u003Cem>intensity\u003C\u002Fem> (PPFD) is just as critical. Aim for \u003Cstrong>500-800 PPFD\u003C\u002Fstrong> during the flowering stage for dense buds.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Plants Need Rest:\u003C\u002Fstrong> A dark period is beneficial for plant health and metabolism. This is why 18\u002F6 and 20\u002F4 schedules are often more stable and forgiving than 24\u002F0.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fautoflower-light-schedule-comparison-18-6-vs-20-4-vs-24-0.webp\" alt=\"A comparison infographic for autoflower cannabis light schedules. Column one shows 18\u002F6 as the balanced, beginner-friendly gold standard. Column two shows 20\u002F4 for faster growth and higher yields. Column three shows 24\u002F0 for maximum light hours and warming cold tents at a higher power cost.\" width=\"772\">\n\u003Cfigcaption>\n\u003Cp class=\"ng-star-inserted\">\u003Cspan class=\"ng-star-inserted\">\u003Cspan class=\"ng-star-inserted\">Choosing your rhythm:\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"ng-star-inserted\"> Use this quick-reference guide to balance plant health, electricity costs, and growth speed. Whether you prioritize efficiency (18\u002F6) or maximum output (20\u002F4), the right choice depends on your specific environment. \u003C\u002Fspan>\u003Cspan class=\"ng-star-inserted\">Image credit: WeedSeedsExpress\u003C\u002Fspan>\u003C\u002Fp>\n\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\u003Ch2>Why the Right Light Schedule is Crucial for Your Autoflowers\u003C\u002Fh2>\n\u003Cp>Autoflowers are on a biological timer. They don't wait for shorter days to start budding like photoperiod strains do. That freedom is awesome, but it also means your \"day length\" is a tool you can use to shape growth, yield, and energy costs.\u003C\u002Fp>\n\u003Cp>This unique trait is just one of several that sets them apart; \u003Ca href=\"https:\u002F\u002Fweedseedsexpress.com\u002Fuk\u002Fblog\u002Fhow-to-grow-autoflowers\">understanding their entire lifecycle\u003C\u002Fa> is the foundation for a successful grow.\u003C\u002Fp>\n\u003Cp>Here's the core idea: more light hours = more photosynthesis. Photosynthesis is how plants turn light into sugars, the building blocks for leaves, stems, roots, and buds.\u003C\u002Fp>\n\u003Cp>But plants also benefit from a dark period to run \"maintenance\" processes and avoid stress. With autos, we aim for a sweet spot between 18 and 24 hours of light per day.\u003C\u002Fp>\n\u003Cp>The exact choice depends on your goals (max yield vs. efficiency), your environment (hot vs. cool room), and your strain's vigor.\u003C\u002Fp>\n\u003Cp>Short answer up front: 18\u002F6 is the safest, most balanced schedule for most growers. 20\u002F4 can push a bit more growth if your setup is dialed.\u003C\u002Fp>\n\u003Cp>24\u002F0 is the aggressive play, works in cool rooms but can be wasteful (and occasionally touchy).\u003C\u002Fp>\n\u003Ch2>The Top Autoflower Light Schedules: A Head-to-Head Comparison\u003C\u002Fh2>\n\u003Cp>Below, we break down the common schedules. We'll give you the plain-English pros and cons and exactly when we'd use each one.\u003C\u002Fp>\n\u003Ch3>Autoflower Light Schedule Comparison Chart\u003C\u002Fh3>\n\u003Ctable>\n\u003Cthead>\n\u003Ctr>\n\u003Cth>Schedule\u003C\u002Fth>\n\u003Cth>Best For\u003C\u002Fth>\n\u003Cth>Pros\u003C\u002Fth>\n\u003Cth>Cons\u003C\u002Fth>\n\u003C\u002Ftr>\n\u003C\u002Fthead>\n\u003Ctbody>\n\u003Ctr>\n\u003Ctd>\u003Cstrong>18\u002F6\u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd>\u003Cstrong>Beginners, Warm Rooms, Balanced Grows\u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd>Excellent growth, lower energy costs, less heat, plant rest period\u003C\u002Ftd>\n\u003Ctd>Potentially slightly lower yield than 20\u002F4\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong>20\u002F4\u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd>\u003Cstrong>Experienced Growers, Cool Rooms, Max Yield\u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd>Faster growth, potentially higher yields\u003C\u002Ftd>\n\u003Ctd>Higher energy costs, more heat, can stress weaker plants\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong>24\u002F0\u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd>\u003Cstrong>Cold Environments, Experimentation\u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd>Maximum growth potential, keeps tent warm\u003C\u002Ftd>\n\u003Ctd>High energy cost, no rest period, risk of plant stress\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong>12\u002F12\u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd>\u003Cstrong>Growing with Photoperiods, Budget Grows\u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd>Lowest energy cost, necessary for mixed tents\u003C\u002Ftd>\n\u003Ctd>\u003Cstrong>Significantly reduced yield\u003C\u002Fstrong>, slower growth\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003C\u002Ftbody>\n\u003C\u002Ftable>\n\u003Cp>\u003Cstrong>From Our Grow Diary:\u003C\u002Fstrong> We recently ran two Zkittlez Autoflowers side-by-side in identical tents. The plant on 18\u002F6 yielded 97g, while the one on 20\u002F4 yielded 108g. However, the 20\u002F4 tent required an extra fan to keep temps below 82°F. For us, the extra 11g was worth it, but it highlights the importance of environmental control.\u003C\u002Fp>\n\u003Ch3>The 18\u002F6 Light Schedule: The Gold Standard for Growers\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>What it is:\u003C\u002Fstrong> 18 hours on, 6 hours off, from seed to harvest.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why it works:\u003C\u002Fstrong> It delivers ample light for strong growth while giving plants a nightly rest window to reset and manage stress.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Pros you'll feel:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Lower electricity use versus longer schedules.\u003C\u002Fli>\n\u003Cli>Easier heat management; those 6 dark hours can be set during the hottest part of the day.\u003C\u002Fli>\n\u003Cli>Forgiving for beginners: less chance of light stress or overdriving plants.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>\u003Cstrong>The trade-off:\u003C\u002Fstrong> Compared to 20\u002F4 or 24\u002F0, you might leave a tiny bit of yield on the table, often not enough to matter for new growers.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>When we pick it:\u003C\u002Fstrong> New tents, first-time runs, warmer rooms, or anytime we want the best balance of growth, cost, and plant health. If you're shopping lights on a budget, 18\u002F6 keeps bills sensible and results high.\u003C\u002Fp>\n\u003Ch3>The 20\u002F4 Light Schedule: For Those Pushing for Maximum Growth\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>What it is:\u003C\u002Fstrong> 20 hours on, 4 hours off.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why it works:\u003C\u002Fstrong> Autos keep photosynthesizing longer each day, building more biomass (leaves and stems early, buds later) if the environment and nutrition can support it.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Pros you'll feel:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Noticeably faster veg growth on vigorous genetics.\u003C\u002Fli>\n\u003Cli>Potentially higher yields than 18\u002F6 when dialed.\u003C\u002Fli>\n\u003Cli>Still offers a short recovery window so plants \"breathe.\"\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>\u003Cstrong>The trade-off:\u003C\u002Fstrong> Slightly higher energy costs and more heat to deal with. If your light is borderline too strong or your temps creep above 82°F (28°C), you can hit diminishing returns.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>When we pick it:\u003C\u002Fstrong> Cool-to-moderate rooms, solid LED with dimming, and genetics known to be hungry and hardy. If you've nailed 18\u002F6 and want a bit more, step up to 20\u002F4.\u003C\u002Fp>\n\u003Ch3>The 24\u002F0 Light Schedule: Is Constant Light a Good Idea?\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>What it is:\u003C\u002Fstrong> Lights on 24 hours, zero dark period, from seed to chop.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why some love it:\u003C\u002Fstrong> Maximum daily photosynthesis, especially useful in cold rooms where lights help keep temps up.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Pros you'll feel:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Fastest growth potential under stable conditions.\u003C\u002Fli>\n\u003Cli>No timer needed, stable temps overnight.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>\u003Cstrong>The trade-off:\u003C\u002Fstrong> Highest energy use. Some plants show stress signs over long runs—slight leaf tacoing, stalled prayer posture, or just not looking as \"happy.\" Plants can still grow great under 24\u002F0, but not all phenotypes love it.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>When we pick it:\u003C\u002Fstrong> Rarely. Mostly for cold basements or winter garages where the light is your heater. If you try this, watch the plant daily and be ready to dim or drop to 20\u002F4.\u003C\u002Fp>\n\u003Ch3>The 12\u002F12 Light Schedule: A Niche Option for Specific Situations\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>What it is:\u003C\u002Fstrong> Equal parts light and dark, commonly used to trigger flowering in photoperiods.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Does it work for autos?\u003C\u002Fstrong> Yes, autos will still flower and finish. But yields are usually reduced because you're only giving half the potential light hours.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why use it at all:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>If you're running autos alongside photoperiods you need to keep in flower.\u003C\u002Fli>\n\u003Cli>If electricity is expensive and a smaller harvest is acceptable.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>\u003Cstrong>The trade-off:\u003C\u002Fstrong> Lower yields, slower growth. We don't recommend 12\u002F12 for autos unless you have a clear reason.\u003C\u002Fp>\n\u003Ch2>The ROI: Balancing Electricity Cost and Final Yield\u003C\u002Fh2>\n\u003Cp>Is running your lights for 20 hours instead of 18 worth the extra cost? Let's break it down.\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>From 18\u002F6 to 20\u002F4:\u003C\u002Fstrong> This is an 11% increase in daily light hours and electricity usage. For this, you \u003Cem>might\u003C\u002Fem> see a 5-10% increase in yield if your environment is perfectly dialed in. For many, the extra heat and power cost may not justify the marginal gain.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>From 18\u002F6 to 24\u002F0:\u003C\u002Fstrong> This is a 33% increase in electricity costs. The yield increase is rarely proportional. You are far more likely to see diminishing returns, where the extra light doesn't create a meaningful amount of extra bud, especially if heat becomes a limiting factor.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>\u003Cstrong>Our Verdict:\u003C\u002Fstrong> For most home growers, \u003Cstrong>18\u002F6 provides the best return on investment (ROI).\u003C\u002Fstrong> The money saved on electricity can be better spent on high-quality genetics or nutrients.\u003C\u002Fp>\n\u003Ch2>Beyond the Schedule: Light Intensity and Spectrum are Key\u003C\u002Fh2>\n\u003Cp>Light hours are only half the story. Two other variables make or break your results:\u003C\u002Fp>\n\u003Cp>\u003Cstrong>1. Intensity (how strong the light is)\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Define it simply:\u003C\u002Fstrong> Intensity is how many photons hit the canopy. Growers measure it as PPFD (Photosynthetic Photon Flux Density), in micromoles per square meter per second (µmol\u002Fm²\u002Fs). Think of PPFD like \"sun strength\" at leaf level.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Targets for autos:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Seedling:\u003C\u002Fstrong> 200–300 µmol\u002Fm²\u002Fs (dim the light or raise it higher).\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Veg:\u003C\u002Fstrong> 300–500 µmol\u002Fm²\u002Fs under 18–20 hours.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Early flower:\u003C\u002Fstrong> 500–700 µmol\u002Fm²\u002Fs.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Mid-to-late flower:\u003C\u002Fstrong> 600–800 µmol\u002Fm²\u002Fs. Autos rarely need more than ~800: above that, watch for light stress.\u003Cbr>\u003Cbr>\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fgrow-light-mounting-height-ppfd-intensity-chart.webp\" alt=\"A technical diagram showing grow light intensity (PPFD) at different mounting heights over a 4x4 grow area. The chart shows that as the light moves from 40 inches to 12 inches above the plant canopy, the intensity increases from 441 to 1048 micromoles (µmol\u002Fs\u002Fm²), highlighting the optimal height for flowering cannabis.\" width=\"772\">\n\u003Cfigcaption>\n\u003Cp class=\"ng-star-inserted\">Finding the Sweet Spot: Light intensity (PPFD) changes drastically based on how high your fixture is mounted. As shown in this diagram by Calive LLC, moving your light just a few inches can be the difference between a perfect flowering environment and light-stressed leaves. Always cross-reference your light's height with a PAR meter or the manufacturer’s specifications. Image credit: Calivellc.com\u003C\u002Fp>\n\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\u003Cp>\u003Cstrong>2. Spectrum (the colour mix of light)\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Define it simply:\u003C\u002Fstrong> Spectrum is the blend of wavelengths your light emits (blue, red, etc.). Full-spectrum LEDs mimic sunlight and work from seed to harvest.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>What to use:\u003C\u002Fstrong> A quality full-spectrum LED (3500–4000K white with additional red diodes is great). Blue-leaning light (5000–6500K) keeps plants compact in veg; extra red (deep red\u002F660 nm) boosts flower density.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>Frequently Asked Questions and Pro Tips\u003C\u002Fh2>\n\u003Cp>We've seen the same \"panic questions\" a thousand times. Here are straight answers.\u003C\u002Fp>\n\u003Ch3>What's the best overall schedule for autoflowers?\u003C\u002Fh3>\n\u003Cp>18\u002F6 is the default winner. 20\u002F4 can outperform it in cool, well-controlled rooms. 24\u002F0 is situational. 12\u002F12 only if you must.\u003C\u002Fp>\n\u003Ch3>Will my plants \"sleep worse\" without darkness?\u003C\u002Fh3>\n\u003Cp>Plants don't sleep like we do, but they do run recovery and metabolic housekeeping in the dark. That's why 18\u002F6 and 20\u002F4 feel so healthy. Some autos tolerate 24\u002F0 fine; others look happier with even a short dark period.\u003C\u002Fp>\n\u003Ch3>Did I ruin my plant by changing the schedule mid-grow?\u003C\u002Fh3>\n\u003Cp>Probably not. Autos are resilient. If you move from 18\u002F6 to 20\u002F4 (or back) to manage temps or growth, you'll be fine. Just avoid frequent flip-flopping.\u003C\u002Fp>\n\u003Ch3>My leaves are curling or bleaching, what's wrong?\u003C\u002Fh3>\n\u003Cp>That's classic light stress or heat. Dim the light 10–20%, raise it a few inches, or drop temps 2–3°F. If you're on 24\u002F0 or 20\u002F4, you can also step down to 18\u002F6.\u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fcannabis-light-stress-leaf-tacoing-symptoms.webp\" alt=\"A close-up of an autoflower cannabis plant showing signs of heat or light stress. The top leaves are curling upward at the edges into a "taco" shape, while the serrated tips appear pointed and stressed due to high light intensity or excessive heat in the grow tent.\" width=\"772\">\n\u003Cfigcaption>Signs of Stress: This plant is exhibiting \"tacoing\"—a classic sign of light or heat stress where the leaf edges curl upward to reduce surface area exposure. If your canopy looks like this, your light schedule might be too aggressive, or the fixture is too close. Image credit: u\u002FChainB4nging via Reddit.\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\u003Ch3>Can I keep autoflowers in the same tent as photoperiods?\u003C\u002Fh3>\n\u003Cp>Yes. If your photos are still in veg, run 18\u002F6 or 20\u002F4 and both will be happy. If your photos are in flower at 12\u002F12, autos will still finish but yields will be lower.\u003C\u002Fp>\n\u003Ch3>Pro tips from the lab:\u003C\u002Fh3>\n\u003Cul>\n\u003Cli>Start 18\u002F6 the first two weeks. If plants are thriving (tight internodes, rich green, no curl), bump to 20\u002F4.\u003C\u002Fli>\n\u003Cli>Line up dark hours with the hottest six hours in your space.\u003C\u002Fli>\n\u003Cli>Keep pH in range so the extra light translates into growth: 5.8–6.2 in hydro\u002Fcoco, 6.2–6.8 in soil. \u003C\u002Fli>\n\u003Cli>Don't just crank up the nutrients with the light hours. Perfecting your \u003Ca href=\"https:\u002F\u002Fweedseedsexpress.com\u002Fuk\u002Fblog\u002Fautoflower-nutrients\">autoflower feeding schedule\u003C\u002Fa> is key to avoiding burn. Watch the tips of the leaves—a slight discolouration is your upper limit.\u003C\u002Fli>\n\u003Cli>Train early and gently. With autos, time is precious. \u003Ca href=\"https:\u002F\u002Fweedseedsexpress.com\u002Fuk\u002Fblog\u002Flst-autoflower\">LST (low-stress training)\u003C\u002Fa> in weeks 2–4 spreads the canopy for better light use without slowing growth.\u003Cbr>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fautoflower-lst-soft-tie-placement-diagram.webp\" alt=\"Top-down view of a vegetative cannabis plant with red circles highlighting the specific locations where soft garden ties are attached to the branches. The image demonstrates how to pull stems outward to create a flat, symmetrical canopy.\" width=\"772\" height=\"503\">\n\u003Cfigcaption>The View From Above: We’ve highlighted the tie-down points in red to show exactly how Reddit user u\u002Fzoikoikum secures their plant. Notice how the ties are placed partway up the stems—not at the very tips—to gently pull the branches outward. This creates the \"spoked wheel\" shape that prevents crowding and ensures every bud site gets direct light.\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\u003C\u002Fli>\n\u003Cli>Seeds matter. Great light can't fix weak genetics; engines need good fuel.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>Conclusion: The Best Light Schedule Depends on Your Goals\u003C\u002Fh2>\n\u003Cp>Here's the clean take: Run \u003Cstrong>18\u002F6\u003C\u002Fstrong> if you're new, running warm, or just want a reliable, efficient path to chunky, frosty buds. Try \u003Cstrong>20\u002F4\u003C\u002Fstrong> when your room is dialed and you want a touch more growth.\u003C\u002Fp>\n\u003Cp>Save \u003Cstrong>24\u002F0\u003C\u002Fstrong> for cold spaces or experiments, and keep a close eye on plant happiness. \u003Cstrong>12\u002F12\u003C\u002Fstrong>? Only when you must.\u003C\u002Fp>\n\u003Cp>Watch the plant, not the calendar. If leaves pray gently, colour stays rich, and temps stay in range, you picked the right schedule. Ready to put it into practice?\u003C\u002Fp>\n\u003Cp>Grab proven \u003Ca href=\"https:\u002F\u002Fweedseedsexpress.com\u002Fuk\u002Fcollections\u002Fautoflower-seeds\">autoflower seeds\u003C\u002Fa> from WeedSeedsExpress, set the timer, and let those girls shine.\u003C\u002Fp>",{"au":655,"ca":655,"de":656,"en":656,"fr":656,"nl":656,"nz":655,"uk":655,"us":655},"enabled","disabled","index",{"large":659,"original":660},"https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Flarge\u002Fbest-light-schedule-for-autoflowers.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fposts\u002Foriginal\u002Fbest-light-schedule-for-autoflowers.webp","Autoflower Light Schedule Explained What Works Best",9,"2020-04-29","2026-01-24",{"id":380,"url":352,"title":351,"description":666,"slug":667,"icon":331,"lang_status":655,"status":655,"meta_title":668,"meta_description":669,"meta_keywords":36,"created_at":670,"updated_at":671},"\u003Ch1>Grow Techniques\u003C\u002Fh1>\n\u003Cp>Learn advanced cannabis cultivation techniques to optimize your grow, boost yields, and improve plant health.\u003C\u002Fp>","grow-techniques","Grow Techniques Blog","Master cannabis cultivation with advanced grow techniques. Tips and methods to boost yields and improve plant health at WeedSeedsExpress.","2024-12-13","2025-01-20",[],[],{"id":675,"url":676,"title":677,"first_name":678,"last_name":30,"slug":679,"email":680,"description":681,"socials":682,"resume":684,"featured_image":685},1,"\u002Fuk\u002Fauthors\u002Fweedseedsexpress","Owners, employees and freelancers","WeedSeedsExpress","weedseedsexpress","hello@weedseedsexpress.com","\u003Cp>Our team consists of seasoned growers, cannabis researchers, and writers who are deeply connected to the cannabis culture. We understand the complexities of cannabis cultivation, from selecting the right strains to providing essential tips for successful harvests. We are committed to providing accurate, up-to-date, and trustworthy information to help both beginners and experienced growers navigate the world of cannabis.\u003C\u002Fp>\n\u003Cp>With a shared love for this incredible plant, we invite you to join us on a journey of discovery, education, and celebration of all things cannabis. Together, we aim to empower individuals to grow, cultivate, and enjoy cannabis responsibly while fostering a sense of community among like-minded enthusiasts. Welcome to WeedSeedsExpress, where cannabis knowledge and camaraderie thrive.\u003C\u002Fp>",{"x":683,"instagram":679},"seedsexpress","\u003Cp>Owners, employees and freelancers in love with cannabis\u003C\u002Fp>",{"large":686,"small":687,"medium":688,"original":689},"https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fauthors\u002Flarge\u002Fwse-silhoutte.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fauthors\u002Fsmall\u002Fwse-silhoutte.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fauthors\u002Fmedium\u002Fwse-silhoutte.webp","https:\u002F\u002Fweedseedsexpress.com\u002Fstorage\u002Fauthors\u002Foriginal\u002Fwse-silhoutte.webp",1789136154586]