Quote Originally Posted by BobBong


CFL's give us about 45-65 lumens per watt.
just a quick question i have a few 15w cfl's that have a rating of 6500k lumens and i was wondering what equation you are using to get this figure is it, 6500k divided by 15 watts, as for me this workes out to 433.33 lumens per watt or do you use the full wattage i.e 15w =75w output, such as 6500k divided by 75 watts= which equal about 86.6 lumens per watt.

i think i might have just answered my own question there are the second equation is much closer to your results. :rasta::stoned:

good job bob this thread and your grow logs will be the basis for my grow keep up the good work. :thumbsup:
noodlesqld Reviewed by noodlesqld on . Compact Fluorescent Light Discussion So here we go again pot fans. BlackJack Round 2. germinating 6 seeds directly in soil. For those that followed my last grow, enjoy. For those that are following it for the first time...Enjoy :) I'll keep ya updated as the weeks go by. Rating: 5