Thanks Stinky, I was waiting for your reply!! I have them under a 4' 2-tube shop light with 'cool white' tubes for 14-15 days now. Don't really care that much about the electricity, I do a lot of welding here so a 1000w on for a extra week or 2 is no big deal But will I get bigger yield by going to the 1000MH right now? It's in a cool tube and temps in my grow room are 74-80 ALWAYS. Thanks!!