Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Is this bulb dimmable without changing dimmer switch to something special?
Document: I am impressed  with the progress of the LED bulbs with higher light brightness and also dimmable bulbs are now available and you can change 3 way switches to  dimmer switch on your lamp.
I bought this to replace a 100 watt incandescence in a recessed fixture with a frosted glass cover on a dimmer switch. The positives: its bright, the color is pleasant, and it turns on immediately (no lag). The negatives: its too bright and it doesn't dim enough.
These bulbs were placed in my 6 inch can lights. I have 4 in the room and boy does it make it look like it was the middle of the day even though it was really the middle of the night. I personally like a bright room, but my wife doesn't so because these babies are dimmable we will be installing a dimmer for the room. If I get a chance to review again after I will.
First off - get a dimmer. These things are stunningly bright! Unless you are shooting movies or these things are in a high, warehouse ceiling, they're going to be too bright without a dimmer. The color is VERY good with a very slight shift to red, so they don't like those overly blue 6500K bulbs. The look like a cooler version of those bulbs in jewelry stores. At full brightness they only get slightly warmer than my body temperature.
I was fighting the push to replace my incandescent bulbs with compact fluorescent bulbs. For one, I didn't like the high mercury content of CFLs. Second, CFLs can't be used with a dimmer switch (which I have in my basement for controlling the lighting). I fought LEDs, initially, due to the cost and unknown reliability. Drops in cost have caused me to take another look.These lights produce much more light than the 65 watt incandescent bulbs I had in my recessed lighting.
They come on instantly with no warm up time. They don't buzz [under dimmer] and dim down to what looks like less than a quarter of their full brightness. Most dimmable CFLs can only get down to about 1/2 brightness. These 18 watt LEDs are brighter than some 32 watt 2000 lumen CFLs. I don't know how. Maybe it's the color balance. Let's see how long they last. If one fails in under the 27 rated life, I'm certainly getting a refund at this price. Recommended!
We needed to replace bulbs in very high track lighting that blows through CFLs. This bulb is VERY bright (much brighter than any CFL we installed), but also very cool. We are going to switch these bulbs from the living room to the kitchen, and look for an equivalent brightness, but on the warmer side. Great bulb -- all the problems were my fault.
I had purchased this bulb to compare to two othersthe light that came off this bulb was definitely cold and I didn't realize it was not dimmable so needless to say this one came in last place.
A few months ago, I thought it was time to give a couple of these Kobi 18-watt LED bulbs a try. I was very pleasantly surprised at just how much light they put out. The first one went above my wife's makeup area. She wanted a light bright enough to easily see what she was doing, and this bulb did the job without a problem. The second bulb went  in the washer/dryer nook, and easily buried the bulb we had in there before.
I am no judge as to how long these will last (my electrician says many many years) but I have seen a burnt out bulb (that the electrician threw away) so they do have a lifespan. The reason I love this is that even though it is LED, it acts like a regular CFL bulb (except it costs a lot of money). It is dimmable. It has 5000K, which is a bright white light (I hate the yellow light of the 2700K).
Answer: yes