They should love that supplemental side lighting!! 
I've been thinking about hanging another light like how you have, but I only have thousand-watters. I'm trying to decide if I can justify another $70/month on my power bill or would it be worth the return to fork out the money for a 400w or 600w ballast and bulb instead (and paying an extra $30-$40/month)...or doing without, which I would rather not do lol...
I've gotta Big Bud that reminds me a lot of how your plants looked 2 or 3 weeks ago...I'm very proud of it LOL
The relationship between light(point source/bulb) and distance are defined by the inverse square law. This law affirms that the intensity of light changes in inverse proportion to the square of the distance.
I=L/D square root 2
Example: say ur 600W bulb produces 90,000 lumens.
So if you wanna figure out where ur lemuns will be 2 feet from the plant and 3 feet.
here's how I figure out
for 2 feet take the 90,000 divided by square root 2 which is 4 the answer:22,500 lumens
3 feet away, again 90,000 divided by square root 3 which is 9. answer: 10,000
and so forth.
With this formula u can figure out how much coverage u are getting for ur plants.
lol
Hey z, thanks for the formula...I just started doing a little math.
I think you meant to say the square of the distance (you did in the beginning), instead the square root... (like in the example)
The square root of 2 is a long decimal 1.414...
The square (x[SUP]2[/SUP])of 2 (2[SUP]2[/SUP])=4.
I don't mean to sound like a smartass lol, just wanted to clarify in case someone else was to run into this and not understand...
haha
