how far should seedlings be from grow light

Today, I answer the question, how far should seedlings from your grow light? This assumes you are using an LED light, which is the most efficient type of grow light. The seedling phase is the most important because what happens in this stage affects the plant long into adulthood.
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[@SteveTurtle]

Thanks! Great information!

[@yearofthegarden]

So key, thanks for the insight. I've grown large greenhouses full of tomatoes every year, always ahead of my competition, but this year I started them inside under grow lights, and ultimately I stunted them which in the end has produced about one flat of tomatoes all season, vs multiple flats every week. I'll have to get a lumen meter

[@joshuarudd6297]

Yea lumen meters are cheap! You’ll be surprised how much light plants need. Just cause it’s bright to your eye doesn’t mean it’s enough for the plants. Thanks for checking in.

[@BluelightGaming1]

I'm confused here... Are you saying to put 40,000 lumens of light 6 inches above the seedlings? That's insanely high. Most ppl use about 5,000 lumens 1 to 2 inches above. I would think 5-10 thousand lumens would be correct, regardless of where the light is. Your light meter is measuring LUX which is not the same as lumens. 40,000 lux does not equal 40k lumens. This info is confusing.

[@joshuarudd6297]

1 lux is equal to 1 lumen per square meter. it's very confusing honestly. So when you buy the light the measurement is in lumens(total light generated) but the meter measures lux(total light in one meter). Sunlight is easily over 100k lux so 40k is actually very dim. since I'm using LED lights, the heat generated is small so I can keep the lights close to the plants. I like to keep my lux between 25k-35k for a good spread of coverage versus intensity which is usually between 6-18 inches away from the plant depending on the light. Does this clear some things up?

[@BluelightGaming1]

@@joshuarudd6297 I've tried to respond to this twice but it keeps getting deleted. Check your filter please.

[@joshuarudd6297]

@@BluelightGaming1 I Dont control the filter and i cant see your blocked comment. Susan is always watching. we can always continue this on Email. [e-mail]