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Can a 1000w LED grow light be closer than 60cm (24") to a seedling?
einamiostarted grow question 10 months ago
Different sources are saying: 1000w LED light should not be closer to a seedling than 60-75cm (24"-30"). The seedling should be getting 5000-7000 lux, 100-300 PAR (PPFD 18h) and 12-20 DLI.
Question: Can I put the light closer at ~40cm, dimmed to match the needed lux, par and dli
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Thabsanswered grow question 10 months ago
Yep! I think what you were reading was people saying that a 1000w LED at 100% power should never be closer than xyz. However, if your light has a dimmer on it, you can drop the power level and lower your lights. Use your PPFD meter to get the seedlings back in the 100-150 range (that's where I leave mine until they start asking for more light.)
damianfoxanswered grow question 9 months ago
Get a LUX meter from Amazon. This tool is very important.
Seedling(s): 9-15k
Veg: 15-25k
Flower: 30-45k (I do 40k until the bud is fully formed than I do 45k)
Try not to go over 55k LUX while in Flower, It could bleach your buds and also possibly give you foxtails especially with LED's.
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Sciolistic_Steveanswered grow question 10 months ago
"1000w" means a lot of different things.. sometimes it's "equivalent to 1000 watts" etc.. so more info needed on that.
20 dli is a good number to shoot for early on, but you need accurate specs and some general knowledge to guesstimate what your light is producing.
fwiw, 100 ppfd is only 6.5 dli over 18 hours, which shows even the people repeating these suggestions don't know the math, lol. they are 50% off on lower value.
in the end, you use the resulting growth to dictate how much to dim or how far away etc -- if it stretches too much, it needs more. If it is too tight between nodes, you reduce the light. while it doesn't apply to early on, later on the distance should be about best light distribution, then use dimmer or hours of operation to fine tune DLI.
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