Hydro it looks like a 65 watt bulb from a light I saw at Home Depot made by Lights of America. Sorry if Im not too specific but are you referring to the bulb itself as in brand, type, Kelvin? If so its considered a compact flourescent, its just bigger (and brighter) than the compacts you see at walmart or other places. Not trying to insult your intelligence here if I am giving basics, its just I dont quite understand your question completely. Can you be a little more specific with what exactly you want to know?...:thumbsup:Heres a link to one I found that looks like yours. 150 Watt Compact Fluorscent