These are actually the replacement bulbs for the Model Power 2 1/4 Street Lights. Since it seems Model Power is either going out of business or simply discontinuing a lot of the items I tend to use, these will come in quite handy. I'm pretty sure they can be used in most of their other street light products or to simply light a building up. Simply pull out the old bulb and fish the new one through the lamp post. Nice product to have around.