I have both already. What is a good humidity range to strive for 40-60%?

I have never used HPS lamps. I tried reading through the information here, but it was confusing at best. I think I want to run a smaller setup than most on here. How many HPS would I need for my room to grow 3 plants? Where is the best place to buy those? Can I use both? Sorry about all the newbie questions...

Thanks for all the information so far...
jar3232 Reviewed by jar3232 on . New Room Design Questions - W/ Pics So I decided that I have this neat old coal room in my house that I should just convert into something more permanent. I has the old style Michigan walls which make a nice natural shelf. I am also going to use a lot of "budget stuff" with this one, but I am going to upgrade over time when I get a feel for the new room. Obviously this room needs cleaned out. It is roughly 4 x 8 and about 5'10" high. I am going to cover the walls in Mylar "safety blankets" or with a Mylaresk reflective bubble Rating: 5