What Lighting Schedule Should I Use?

I use hps lighting only....so look into hps/mh switchable lights...they will run metal halide bulbs and hps bulbs...
 
I've read a bunch of people saying that they use a 24 hr cycle for veg, or atleast part of veg. Why 18 instead of 24? Is 24 bad, or is 18 just better?
 
a plants "photoperiod" is only for 18 hours, if you put a 24/7 plant next to a 18/6 plant and looked and the difference, there wouldnt be any...
 
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