Question on Lumens and LUX

So I have just finished reading an interesting article about Lumen’s and LUX.

LUX is Lumens/meters squared.

Example. A 400 watt HPS that puts out 50,000 Lumens will have a LUX of 50,000 at 1 meter squared and 25,000 LUX at 2 meters squared.

My understanding from this article is that you want to aim for more than 25,000 LUX for best possible flowering (from 25,000 to 50,00 LUX)

My question is what if you have a space that is less than 1 meter square? For simplification purposes what if the space is only 1/2 of a square meter? (70.71cm x 70.71cm = 5,000 cubic cm)

How would I calculate the LUX for this space for a 400 watt HPS that spits out 50,000 Lumens?

Is it 75,00 LUX, 100,000 LUX, is it something else or does it just stay at 50,000 LUX?

THX

PS – This is the interesting article. Marijuana Lighting Types and Intensities

Bump

I would calculate it in sq. ft. and stick with a minimum of 3,000 lumens per sq. ft. Sunlight produces 10,000 lumens per sq. ft. so basically the closer you stay to that without burning the plants the better. Keep it simple man.

ChronicGrower said:

I would calculate it in sq. ft. and stick with a minimum of 3,000 lumens per sq. ft. Sunlight produces 10,000 lumens per sq. ft. so basically the closer you stay to that without burning the plants the better. Keep it simple man.

Click to expand...

So if I have an 8500 lumen bulb in a 2' x 2' area how many lumens do I have per square foot? If it is only 2125 then that contradicts the article I just quoted.

Add some CFL's to up it to a minimum of 3,000 lumens or get a bigger light.