If you are only using red and blue LEDs, then a CFL will add the missing light frequencies.

The latest five-band LEDs require no supplementary lighting.
RackitMan Reviewed by RackitMan on . CFLs + LEDs??? Sup guys.... Was wondering if I need to add some CFLs in my LED grow. Ive seen grows on here with and without CFL additions... Is it worth it? Rating: 5