The 4 18w LEDs are blue red and white all 3. But looks to have abit more blue in it. If you look at the first pics of my closet you will also see my pro-source 90w led and it works great. The 18w4 livhts are mainly for the middle/bottoms of the plant so they have thorogh lighting all over. As for the fans i keep them on 24/7 but i have fan speed controllers on them i run the exhaust now at about 70% since its hooked to a carbon filter and the intake is only running at about 30%. Still need to buy me a clip fan for some better air action inside. Its not bad with just the intake but i would like alittle more plant movement for stronger branches and main stalk. If there is any other details you would like me to share just ask and ill do the best i can to help ya.