I had a micro-grow wayyyy back in the day. Used a 70watt MH and a 70watt HPS. I only used the commercial 'general lighting' bulbs (obviously, no grow bulbs in 70w ) and I must say that that system worked better than the 150watt HPS (also with generic, commercial lighting HPS bulb) that replaced it.

Don't know if it was the spectrum, or the fact that I could get my trained plants an inch closer or what.

I almost bought a Sun System Super Spectrum hood for 2x250watt ballasts but decided to try a Lumatek electronic.