Electronics, Lighting, & Gadgets - Anyone know where to get this bulb?

I've got a small incandescent tail lamp on my bike-- the bulb is a tiny screw threaded thing (E10 or something like that-- it's a tiny screw base)? The base says 0.5W, the glass ball is round and it has a rather tiny filament. Does anyone know where to buy replacements for this type of bulb?

Sounds like an old-fashioned flashlight globe. My first port of call would be a specialist electronics shop, e.g., Tandy.

http://www.esamjones.com/
If they don't have it, they can probably get it.

If it uses two batteries for a 2.4 volt bulb you can replace it with a 5mm LED. Personally I would just use a blinkie.

Bring the bulb in to either Ace hardware or Radio Shack. It sounds like a very common threaded bulb and they have all of that stuff.

Thanks for the tips- I found an online retailer with similar bulbs, but I'll also check out the local hardware store and the Radio Shack. They seem pretty cheap-- a few cents a piece.

You're right about it being similar to an old fashioned flashlight bulb- it's very similar to one of those. No batteries though-- runs off of a tire-driven generator (tail lamp develops about 2.5 volts and runs at about a half watt).

Thanks for the tips- I found an online retailer with similar bulbs, but I'll also check out the local hardware store and the Radio Shack. They seem pretty cheap-- a few cents a piece.

You're right about it being similar to an old fashioned flashlight bulb- it's very similar to one of those. No batteries though-- runs off of a tire-driven generator (tail lamp develops about 2.5 volts and runs at about a half watt).
Check this site for information on using LED's with hub and tire driven dynamo's.
http://pilom.com/BicycleElectronics/DynamoCircuits.htm