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Check out this simple chart. It helped me quickly, it may work for you too.

Not to butt in, but I am pretty sure you only use 1 bulb at a time. The MH bulb is for the veg cycle and the HPS is for the flowering cyle, When I bought my setup, it had the bulb choice also. Go with one of each and use as directed above and you'll be happy! Unless I'm missing something, cuz...