Not sure the efficiency of cfl's but most hps is around 20-25% if heat is a concern going with cobs or ceramic metal halide is the best option. Cree 3070 cobs are close to 50% and the ceramic metal halide by sunsystem and hydrofarm are 43% efficient. Those numbers save you on heating costs and also give your plants alot more usable watts. I just picked up my second cmh315 this week and these things are pretty amazing. 350$ too!! I'm also running 16 cobs and Cree monos that surround the cobs. Wattage wise my room just became visible from space lol! I'm running 3 of the Amare se-450's I got on a 4-20 sale and haven't looked back since. Beautiful lights and a great warranty too. As far as cfl cost goes Tim Foxks right but it's also the easiest to expand.
There is a thread here called just got my ge brightsticks. They are running regular e-27 screw in leds with a modified reflector and seem to be doing pretty well. I think the diodes turn out to be 1w each which is pretty decent considering a cheap bulb.
Passed this big bitch on the way to work this morning. Yuck! Good luck with your lights man. Feel free to keep the thread going. Oh and the turtle has nothing to do with lighting choices either.
View attachment 3701615