I am currently running 4 100W 5000k CFLs for 2 seedlings. They're still in their 1st week of Veg but I have a question for when they're ready for the flowering stage... Since I am running 4 5000K CFLs do I need to switch to 4 2500K CFLs for flowering? I have read multiple sites/forums/pdf books but many seem to have different opinions so that's why I ask.
look at the lights spectrum. you want as much 660 nano-meter light as possible going into flower. most lights lack in this area just get as close as you can.