Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Are they dimmable?
Document: Guess I should have read more of the fine print, but so you know these are NOT dimmable. Otherwise, I have 3 identical ceiling fixtures that I tested these xenons out against the normal halogens, special order led bulb. For brightness and clean, white light, these were far and away the best.
You get two for the price of one from your local hardware store. They are exactly the same as the ones that came with my light. Gives good bright focused light. Well worth the price.
With the LED, virtually no radiant heat felt although if touch base or bulb itself is hot but not burn fingers hot like halogen. But most important no radiant heat.From limited testing (have to wait for halogens to cool before I can even touch the base) the LEDs at 7 watts total do not seem as bright as the 50 watt FEITs. But the intense white is the biggest problem, fortunately I only bought one as a test and may try and return it (came today).
What I missed is the HUGE color difference. Feit claims "whiter, brighter, cooler"Not sure if brighter means the FEIT 50 watts is brighter than others. Tried to compare lumans but depends on distance away and while I find the lumans rating on LEDs so far don't find it for the Feit or if its even a good comparison.Whiter - well nothing like the TOO WHITE of the ALTLED totally brilliant pure while is too harsh but no other color like warm or soft white given.
We have a 5-lamp track light above an island in our kitchen. It's mounted to a low ceiling (7ft) and shines on a granite countertop. The fixture is low profile and fits the decor of the kitchen great. The problem we were having is that the 50 Watt Halogen lamps would only last 1-6 months before burning out. I got the fixture from Home Depot, and they couldn't really tell me why the lamps didn't last. They even gave me a free replacement fixture.
Update 11/5/2013: so the life is about two and a half years. Two burned out the same week, so it seems pretty consistent.Update 1/18/2010:  Purchased four, of those four one burned out within a week. Others seem to be okay. May be the lightbulb may be the fixture. I'll keep this updated.Original Review:  These are nice bright lights that are much smaller than I thought (but that's a buying error not a problem with the product).
Until then, these are holding up just fine.
This bulb works just fine in our kitchen. It cost much less than the originals from the light store, so I'll buy more in the future.
This bulb burns very hot. I can't imagine that is good for energy usage or for the fixture. But I am no electrician.
These xenon bulbs are great. The price I paid for them is about what I would have paid for a typical halogen. They exude less energy, and are brighter. Would definitely purchase again.
Answer: yes