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Bulbs are 35mm long and don't last very long
on June 3, 2013
I've bought a lot of Feit bulbs over the past few years. They typically last longer than the name brand bulbs at the big box stores (much longer than GE bulbs), but these little 35mm long Feit xenon bulbs are a notable exception.
I have those black, round puck lights under cabinets upstairs and downstairs. 8 total. They all had some blue-colored bulbs provided with them, though they produced white light.
I got 3 Feit bulbs last spring at a big box store and used them by fall, so I bought 3 more from the same store. I went ahead and bought 6 Feit bulbs on Amazon, just to make sure I had enough spares. Well, it turns out that the original blue bulbs kept on going, while the Feit bulbs I had just put in were already burning out. I ended up going through 8 more Feit bulbs between last fall and this June, leaving me with only 1 spare bulb (11 bulbs used out of 12 purchased).
Interestingly, 1 of the bulbs is still a blue OEM bulb with no name on it. Wish I knew the brand...
FWIW, I checked the AC voltage in the house to be sure that wasn't what caused the Feit bulbs to burn out so quickly, but I'm running between 120V and 121V each time I check.
I should note that the failure mode for all of the Feit bulbs that I have replaced is the same: broken filament. (Touching a halogen bulb with exposed skin typically results in glass breakage, so I do use disposable gloves to install them)
Addendum: well, I did a lot of digging and found some interesting information! Here's some of it:
* Halogen bulbs are typically made from quartz or special glass due to the high gas pressure in the bulb (around 100psi+).
* Xenon bulbs are made from normal glass due to the much lower xenon gas pressure required.
* Halogen bulbs have a tendency to break if touched with bare skin, whereas xenon bulbs don't. This is partly due to the higher pressure and thicker quartz or glass used in halogen bulbs. Xenon bulbs don't need to be installed with gloves! :)
* Halogen bulbs produce a yellowish light, whereas xenon bulbs produce a whiter light.
* Halogen bulbs don't last as long as xenon bulbs.
* Halogen bulbs aren't as efficient as xenon bulbs.
* Halogen bulbs generate more heat than xenon bulbs due to the difference in efficiency.
* Halogen bulbs will blacken if dimmed, because dimming interferes with the halogen cycle that redeposits vaporized tungsten back on the filament.
* Xenon bulbs may be used with a dimmer without any ill effects.
* Xenon bulbs are filled with xenon, a noble gas.