The Grow Awards 2026 🏆 
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MangJs
Substrate Germination - lightingHi Growmies!,
just a quick question on lighting on germination just want to know your methods.
do you 18/6 lighting or 24 hours on germination period? is it worth doing 24 hours? whats your preffered method
Thanks allSetup. Lighting
Germination. Substrate
5y ago
4
4
Solved
ItsGrowingOnMe
1 inch seedling under a humidity dome sprayed with water in a 24x24x36 Vivosun tent. I’m using a mars hydro ts 600 watt led which is 21 inches above my seedling (small tent). Do I downgrade to my 150 watt ufo light until I can do LST? This mars led is definitely warming up thingsSetup. Lighting
4y ago
3
4
Solved
Abacus
Invert light/dark during a growFor veg period is better if I start with light on in the day, and off in the night, but for bloom period it will be too cold, can I invert light/dark during a grow? I will have light on in night and light off in the day.. does the plant have any problems if I do that?Setup. Lighting
3y ago
6
Solved
SirTucksAlot
Will UV (reptile) lights disturb the day/night cycle in flower?Setup. Lighting
5y ago
3
5
Solved
QuiGonJib
Almost doneThis is our first grow and we are in week 6 of bloom. Does anyone have an idea for the brother in the picture. He grew above the lights. We not sure how to handle it. Two leaves are to close to the light and turned yellow. Should we cut them away or leave them on itLeaves. Color - Yellow
Setup. Lighting
4y ago
1
2
Solved
Jojoman
Greenhouse times endingHi good people of GD
My random seed survived 2nd week in Greenhouse. Luckily the weather is hot for end of September however i know i have to shift to indoor.
When should transplant to a bigger pot and when?Plant. Too tall
Setup. Lighting
Setup. Outdoor
5y ago
3
3
Solved
GreenleafSWO
Grow light height in floweringI have a lumatex ATS 200w led, I've it raised to max height but I've still only 10 inches of clearance from the canopy. It's flowering now and upward growth has stopped as buds are starting to fill out, will I be ok with this short distance?Week 8
Setup. Lighting
3y ago
2
4
Solved
VermeerT
New person to grow, what is picture with lamp?Hi! I just to start first time on weekend is GD safe?
I just now have a mars lamp it is looking like recommend and cheep but is difference picture with numbers and I do not know what is this.
Can someone help me what high I should put it? I am with auto is this 12 hours or more?Setup. Lighting
4y ago
4
4
Solved
Snooziecheesecake
Lighting questionI am running the Viparspectra 450w LED as my light for 4 autos in a 2x4 space. I am worried this isn’t enough, especially because of its lower levels of red. Should I upgrade to something stronger like a Mars hydro 600 or 1000 before flowering start?Or if not Mars something else?Week 4
Setup. Lighting
5y ago
2
5
Solved
zunz16
light schedule changeI wanna change light schedule for my babies.. for now they run from 07 to 24 hours and I want to run from 18 to 12 hours so I would have dark period during day.. should I just leave it to run for 30 hours and then introduce new "night" time?? Plants are 4 autos 7 and 8 weeks oldSetup. Lighting
5y ago
4
4
Solved
MedusaCurse420
Putting two lights in a 60x60 worth it?fellow growers, I have at the moment 2 150w lights and i was wondering for flowering it would be any good to put the extra 150w light that I have (it is a 60x60 so small space to tuck in 2 lights but if it is really worth it i sure I'll find a way). let me know what you guys thinSetup. Lighting
13d ago
3
4
Solved
girlwhogrows
best LED light 4x4Best LED grow light for a 4x4
Could anybody please suggest which LED light they would recommend for a 4x4 grow.
Willing to spend around £500 maximum as I really want to invest however most videos on YouTube are marketing their own. Really appreciate your advice.
Many thanks!Setup. Lighting
2y ago
26
11
Solved
TommyBVRSA75
Como racionar ciclos de luz diferentes em grows con crecimientos diferentes?Tengo Indoor una fotoperiodica em início de floración con 15 semanas y una auto com 3 semanas en início de vegetativo. Las dos con 18/6 luz. Estan en Scrog. Como hare para poder la foto em 12/12 pues esta en la tienda em Scrog y la auto de 3 semanas que está si puede seguir 18/6.Setup. Lighting
4y ago
1
3
Solved
Grow3rPT
Horário da luz (Sementes Auto) floraçãoAcham que devo manter a luz 18/6 ou 12/12? São ao 4 plantas automáticas.Week 5
Setup. Lighting
5y ago
21
1