benifits of more light

My friend has a 250 hps to flower. it is a 2.5 x 3 space. With the air hood he can get it 3 inches from the top of plant. There is like no heat it cools so good.

I know it is a basic guide when a breeder sats it is a 8 week strain. But it takes him 11-12 weeks.

So my question is, will more light help a plant grow and flower faster.
i know it should increase yeild. but what else are the benifits.

Also a 400 watt hps bulb. What ones are good. I see the price from 10 bucks to 110 bucks. What hps buld do you use?
 
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