It is best to use both spectrums through the veg stage if possible and this bulb does both.. about $180.00 us but worth it.. you need a 1000hps to run it... do a search solarmax1 and check it out.
I have a 1000hps and for veg use the solarmax1 bulb which has a 400mh and a 600hps in the same bulb and then switch to a 1000hps bulb to finish. Unreal veg bulb.