What kind color is the light that comes off? If its a oddly orangy yellow its probably an HPS which is good for flowering and can be used for most of the grow. I would make sure it isnt a mercury vapor though because from what I hear, they do nothing for growing. I would think it should have some writing on it somewhere to help you identify what kind it is. Even if you just found the brand name and a model number you could look up what kind it is.
At the very beginning though you are better off buying some cheap ol CFL,s to get that seedling going.