you should be alright but you're yeild wont be as high mate, you can add some Warm light CFL's 45w or higher... that will give you some extra light for bigger yeilds hopfully, and use the cool white Fluro's lad, and you'll be alright
you still need ventilation and cooling with the envirolites, fresh air is a big factor remember and the more control u have over your temps the better, imo hps is always better as long as you got the space and you can cool it