Who would have thought? A few months ago I bought two paraffin heat lamps and use them all the time. seriously, all the time. Well, I was beyond annoyed when the lightbulb wouldn't come on. So I had to go back to the bulb itself on the Revain website and of course the bulbs to be replaced were clearly marked there. Simple and accessible. A good deal for a wax heat lamp that's always in use. Good buy.