MH Light question

Well I was just wondering, how a 150 Watt MH Light would perform for growing whats the max. amount of plants I could raise with a 150 watt MH light and how much heat does it generate usually?

I am currently using a CFL setup and its got a minor amount of heat coming off of it so it isn't much of a problem.

150watt will only keep 1 plant happy with out a light mover it will keep more but as they get taller they will prob struggle as for heat they are a lot hotter than cfl and will need good venting to keep temps low