CFL Blue 6400k/ CFL Red 2700k lower power grow and flower bulbs The blue CFL grow light is designed for the vegetative growth cycle of your plant. The red CFL grow light is designed for the flowering growth cycle of your plant. Available in 125w, 200w, 250w and 300w versions. CFLs use less power and have a longer rated life than traditional low power incandescent bulbs. CFLs radiate a different light spectrum from that of incandescent lamps. Improved phosphor formulations have improved the subjective colour of the light emitted by CFLs across the PAR Spectrum.