Hello all. I myself use a 400Watt Eye Hortilux Super HPS Bulb. Now this particular bulb increases the amount of blue and green spectrum light your plants take in by 30% over standard HPS bulbs while still producing the red and yellow spectrum light you need for flowering as well. So in the end all you need is one bulb to produce cannabis from start to finish. Hardon what you said about the blue spectrum light interfering with the cannabis flowering stage is illogical. Blue or green spectrum light will not negativly affect the plants during the flowering cycle instead the plants will just not use any of the light in those spectrums. Instead the plants will only use the red and yellow spectrum light instead. Now there are other spectrums of light other than blue,green,yellow and red such as orange for starters however cannabis growers do not need to concern themselves with the other spectrums as they are too far off from the primary bands to be benifical in any way. Not trying to correct you hardon. Sorry bout that.