What light bulb is this?

Looks like a bulb used in a "EXIT" sign in buildings. They are usually several dollars each. Night light bulbs work just fine as a replacement.

I would send the photo and any text you find on the base of that lamp (IE: 15W 120 V or 40W 120V) also, re-take the photo with a pair of crossed rulers one "Under" one "Beside" the lamp.

Send it to Super Bright LED's or some other company like that and ask them.

odds are they will respond with their catalog number.

As stated, that looks like the bulb that comes out of the bottom of a microwave. My Sharp Microwave has two. I replaced them both with one of these.

Bulb

And the base that it needs to make the bulb fit.

Base

OP:
What size is the base? Is it about 1/2 inch diameter or closer to 3/4?

Lamp? Comes in various wattage. Not sure about LED

BillB800si wrote:
You can buy LED equivalent candelabra bulbs. They're not cheap.
Start looking here: LED Candelabra

Happy trails,

The bulb in question is not a candelabra. I'm not sure where that's coming from. The base is the same size, but standard shape bulbs also come with this base.

The increase size may not fit the application. I was not able to substitute for the lamps I needed it for, so if this was the OEM bulb shape, it was probably chosen for a reason.

Also, beware of those 5w/40w equivalent LED's candelabra's. I've tried them in two ceiling fans with very poor results. They are very dim.

The 6 watt versions are a different design and might be worth a try if the shape works for the application. Thing is, if the larger shape does fit, there are better LED bulb options!

Post make and model of the microwave or search for microwave parts for lamp. Doubt whether there is an LED replacement.

It's 110, not 12v and is out of the bottom of a microwave, to light over the camper stove.

You can buy LED equivalent candelabra bulbs. They're not cheap.
Start looking here: LED Candelabra

Happy trails,

Maybe it is for your Christmas tree :)