I have to determine the necessary lighting for a currently dimly lit warehouse, and I don't really know how to go about doing this. What do I need to know in order to determine what type of lamps or how many fixtures, etc., are necessary? All I can tell you is that I think we're using 400 w mercury vapor lamps at the moment in highbeam fixtures (I think that's the correct terminology?) Any help would be appreciated. Any formulas would be handy for determining how many more fixtures are necessary or anything like that.