It's a 250w HPS light but it says something about 400w also, since I cant get the url I'll copy what it says

This 250 watt high pressure sodium floodlight is intended use in recreation areas, parking lots, building facades and car lots. This 400 watt fixture has a multi-tap ballast for 120/208/240/277 volts and a bronze finish on a contoured, low profile die-cast aluminum housing. It has a high-performance aluminum reflector and an impact-resistant tempered glass lens. One high pressure sodium bulb is included.