That looks like a 12 volt 36 Watt landscape lighting lamp, with a G53 base, probably one of these. You can't use a cheap hardware store line-voltage LED retrofit unless you change the fixture to a line voltage type. This LED retrofit will replace it, however.

The links are for information, and don't mean that I endorse either the products or the vendors.

Thanks! it is indeed a PAR36. I found LED replacements, but they're all rated for outdoor use and are PAR when what I really want is a regular flood for indoor use. Do you know what that kind of connector is called?

Take it to your hardware store and ask.

That bulb has traditionally been used in low voltage landscape lighting butI don’t think you’re going to find a 12v bulb with that kind of connection in another shape.

If really want something else, then you’ll probably need to replace the fixture. There’s no reason you can’t use an outdoor rated bulb indoors, they’re just built a little sturdier to withstand the elements.

Thanks Mike.

Check out 1000bulbs.com (place I buy most of my stuff). They have LED bulbs with that base and their available as spots and floods.

thanks!