You wanna grow peppers? You don't need HPS for that. A simple metal halide fixture/bulb will grow peppers just fine. Peppers dont' need red spectrum to bloom (HPS), just a short dark cycle.
but like HPS, MH is very hot, and they start at about 400watts so you'd have to install a fan and vent the heat from a closet. My setup was in a basement so I didn't have to mess with it. a 400w MH will cover about a 4' x 4' area. I had 16 pepper plants going in an aeroponic setup in february then moved them to soil after the danger of frost was gone.
when i researched my setup, i saw the LED stuff too. However every setup I saw using them, they had about 10-12 of those bulbs to cover a 4 x 4 area, which made it as expensive as my MH fixture...although it'd have been cheaper on the power consumption. They also were unproven...just a lot of marketing hype.
I also used CF bulbs for starting the seeds (in coconut coir). I hung 2-3 'daylight' CF's taht were the equivalent of 120w incandescents, from pendants over the seed starters, about 6" above the plants. as they grew i raised the lights until they were big enough to go to the aeroponic tubs in baskets with hydrolite pellets.