BigBud992
Well-Known Member
It's a lot of personal preference. I use 24/0 because I'm using t5 HO's - they don't put out a lot of heat, and they're cheaper to run. I've used 18/6 before with the same lights....I did see a difference in how fast my nirvana breeder sativas grew (2 different strains, however). Some people say the roots grow better in the dark, etc. If you're using HID's, u may wanna go with 18/6 to let the bulb cool and keep your room cooler(ish).