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Do halogen bicycle headlamps degrade over time?



I have a good bike light from 10 years ago (Nite Rider cyclops). It's been dormant on a shelf for years. I just bought a new battery and used the light, and it seems much less bright than it used to be, and yellowish rather than pure white. Before I decide the new battery is the problem, can someone tell me if the light may have degraded during all those years of inactivity? Thanks.

Halogens are quite yellow compared to the more modern lights of today(LED, ARC's) so while they may have seemed very bright ten years ago they have just aged a bit but are not any less efficient. You could upgrade the bulb if you want to although it would eat in to your running time.
Thanks for the extra points!

Thanks for the advice, folks. Happy riding.

Clean your electrical contacts and check your lenses. A pencil's rubber eraser is abrasive enough to get crud off the contacts. Yellowing lenses (plastic or glass) can be cleared up by using a clean rag and some metal polish like Brasso or NevrDull (I kid you not).
Nite rider has some great lighting systems, I have a Digital pro12 lcd myself. I've never had a problem with yellowing bulbs, they seem to burn out before turning yellow! Perhaps the age is a factor. As long as the battery takes a charge and you have a normal amount of burn time on the battery, I would try replacing the bulb. Or you might try calling Nite Rider and ask for tech support 1-800-466-8366
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