So I have just finished setting up my room and main light and have done a lumen check all around the grow area and found I have 3900 lumens per sq foot on the perimeter of the garden and the center or sweet spot is up around 4500 lumen/ sq' should this be sufficent For my plants or should I consider some side lighting to bring up perimeter lumens.
Lumen Per sq' question
- Thread starter cateros
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That is plenty! However if you can afford the $$ for more electricity and lights I would go for it. Do as much as you can safely if my motto.
I like 7-10K lumens per square foot, but then again, someone is about to come in and preach about PAR watts, PPFD and how lumens don't matter. 10K lumens is about what hits the earth at midday.
However, you can't buy a decent pyranometer for under $1K and therefore very few of us will ever have or use one, so the figures are as good as meaningless for comparisons.
However, you can't buy a decent pyranometer for under $1K and therefore very few of us will ever have or use one, so the figures are as good as meaningless for comparisons.
lol, here I am 
Lumens don't matter. Plants do not see lumens, lumens is a reading of how bright the light is... whether you have 1,000 lumens or 10,000 lumens the plant will not know the difference. What you need to research is PAR.
But Lazy is right, 5,000 to 10,000 lumens psf is about right. Even though plants don't see lumens, it can still be used to judge your lighting requirements because more lumens means more watts which usually means more PAR.
I'm really no expert though, I am actually still learning about PAR.
Lumens don't matter. Plants do not see lumens, lumens is a reading of how bright the light is... whether you have 1,000 lumens or 10,000 lumens the plant will not know the difference. What you need to research is PAR.
But Lazy is right, 5,000 to 10,000 lumens psf is about right. Even though plants don't see lumens, it can still be used to judge your lighting requirements because more lumens means more watts which usually means more PAR.
I'm really no expert though, I am actually still learning about PAR.
Very true penetration is equally as important , I should have worded it better and mentioned the type of light I am using and the application . SO basically for my flowering room using a 1000w hydrolux bulb in a 30 sq' foot space my light meter reads on the perimeter of the garden 3900 lumens and directly under the light 4500 lumen. these reading are also taken at the floor level when i take readings 2' above the floor the intesity increases to 4300 on the perimeter to 5200 directly under the light .
Oh and finally I have read that the final 2 weeks of flowering to help ripen and also increase resin prduction to switch back to the metal halide light any care to comment on the veracity of this suggestion?
