If it's an LPL C7700 (which is sounds like) it's not an especially bright enlarger. You don't say what paper you're using or what size prints you're making but for 16x12 on for example Multigrade Warmtone, a minute or so isn't that unusual I'm afraid, in my experience at least. The correct lamp for the C7700 is 12v 100W. A new one might help - old lamps can get cloudy and I've seen a one stop improvement in output when I've replaced a blown one.