I have to disagree with Stormin on this one.

Ordinary incandescent light bulbs do dim with age because the tungsten atoms from the filament end up coating the inside of the bulb.

In a halogen bulb, the halogen gas inside the bulb acts to redeposit those tungsten atoms back onto the hot filament, so that the tungsten atoms don't coat the interior of the bulb, so the bulb DOESN'T dim with age, or at least not nearly to the same extent that conventional incandescant bulbs do.

But, halogen bulbs burn out just like incandescant bulbs do.

The whole selling point for halogen bulbs isn't that they're any brighter than incandescent bulbs, it's just that they don't dim with age nearly as much as incandescant bulbs do.