I'll post it if I cant find it again, but in one of my grow books (or online ugh i cant recall -- too many sources) theres a really nice chart that goes over wattage, kwph, lumen/lux, to compare incandesant vs floresent tubes vs CFL vs MH vs HPS.

HPS produces the most lumens per watt. If you want 2 48 watt CFLs (96 watts) each bulb gives ~2700 lumens your getting 5200 lumens when a Home Depot 70w outdoor garage lamp modified will shed like 8 or 9k lumens on 70 watts

Till I find it I usually refer people to this link on Greenmans's site, pretty good and goes over ALOT from temps to wattage to lumen vs lux etc.

Marijuana Lighting Types and Intensities
BongHitBoy420 Reviewed by BongHitBoy420 on . 1st Timer Here - Cabinet Grow First off, let me say thank you to everyone on this forum, as there is a library full of great information here at your finger tips. I decided to set up a home garden, at first for my girlfriend to grow some small herbs, etc. Since then, I have upgraded it somewhat into a growing cabinet. I am a first timer here, so I would like discuss my cabinet and see what I can do to improve my setup. Thank you in advance to anyone with some input. For the cabinet, I got a Sterilite utility storage Rating: 5