low bay 400 watt metal halide fixtures for gym and bleachers, might want to think about a guard over it as well. they have stage lighting available but I would need more info.

This is a good short article on lighting gyms.

I am an electrical construction manager and have done lighting design and installation on many gyms and school multi-purpose rooms. Usual installations are with 400 watt metal halide “low bay” or “high bay” fixtures (it depends on the ceiling height.) These would be over the bleachers as well. The ceiling height has a lot to do with how many fixtures you need (the higher they are, the less light reaches the ground.) The fixtures will need to have a lens cover and, if the ceiling is lower than 20 feet, a metal safety grid to prevent breakage from balls hitting them. Due to code safety requirements in a power outage, about one out of every 6 to 8 lights has to be connected to a generator powered circuit. Sometimes, for a large gym, some 8′ fluorescent lights are added in the ceiling because the metal halide lamps take a few minutes to come to full brightness. BUT, they make newer metal halide lights called “pulse start” that come on right away so you would not need the fluorescents if you use that type (Google “pulse start metal halide” for more information.) The Hubbell Lighting website shows lots of examples of sports lighting fixtures.

At the stage end you might need to allow for a suspended light bar (or two) with floodlights and stage lighting on it as well as lights behind the stage. Stage lighting is usually incandescent because you need to be able to dim it down (quartz floods are the most common.) You would also need a dimming control panel for those lights so that gets a little complicated. Add a comment to your question if you need more help with this, OK?

(note: mercury vapor lights are no longer used)

You can get information on this sort of installation from an electrical supply house like Graybar, All Phase or G. E. Supply (most larger cities have branches of these.) Call them and they can usually provide you with product catalogs and design advice. Most even have a computer program to give you a calculated layout if you have the room dimensions. Good luck!