Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: how many hours do they last?
Document: Do a test with this bulb and a regular incandescent. Open a book and look at the words with the standard bulb, then change the bulb and look at the text in the book. You'll notice that there is more contrast between the words and the page; they look bolder. I use this bulb in a lamp at my desk and wouldn't go back to anything else.Yes, they are expensive, but they last forever, it seems. I think they are rated at 5,000 hours.
I love these bulbs, and they last forever. I last bought light bulbs in 2008- 6 60-watts and 6 100-watts! I'm finally down to one of each and time to re-order. However, if you buy directly from the Vitamin Shoppe website, they are only $4.99 apiece.
The other reviewers mention the nice light this bulb gives off, and talk a little about how it is different from other bulbs. The feature they didn't mention is that they are very long-lasting; on the box it says "Average 5000 Hours," and I believe it. I don't change light bulbs very often at all, which makes them worth the higher price. I recommend these highly.
Plants are not the only living things that need full spectrum light. CFL bulbs are not welcome in my home: they wash everything in cold stark light. Sure you can see and maybe they'll last longer but the eye strain, headaches and depressed state of mind are NOT worth it. THESE bulbs however allow for a full spectrum of light and color that is so very welcoming, warm, relaxing and incredible in the dead of winter up north.
I have been using Chromalux lightbulbs for the past 10 years and I can confidently say they are the absolute best lightbulbs on the market. I've had them last 5 years with daily use. Not only are they longlasting; the full-spectrum aspect has significant health benefits, especially for people who are light sensitive, have seasonal affective disorder or hormone balance issues. The purely-balanced spectrum of light will help regulate melatonin, improve moods and help with overall health and feelings of wellbeing.
I installed these bulbs in almost all the lamps in my house in the year 2000. I've noticed that many bulbs are burning out now -- in other words they've lasted about 10 years. I have had a few burn out earlier in lamps that I use constantly, though.Anyway, the light these emit makes is much more like daylight than your average bulb. Regular bulbs emit a more yellow-colored light, these are more pinkish in color.
the hat is very cute and well made, fit my 3 year old niece well she loves the movie toy story and her friend has a woody hat so all is perfect
Yes, these are pricey, but they are worth is if you are easily affected by the absence of good sun in the winter or suffer from eyestrain and headache from fluorescent bulbs at work (you may want to ask your boss about switching to 'daylight' fluorescents).
This bulb is not as bright as I thought it would be. I have had full spectrum light bulbs before that were brighter, but maybe this one is only 60 watts instead of the 100 watts I'm used to. Plus it emits a more yellow tone light than I thought it would - tried it in different lamps.... I put it in a small bedroom lamp and it made the room feel cozier than it did, so who knows?
This bulb does not seem to be as bright as a regular 60 watt bulb, and I can't tell if it is full spectrum or not. I wouldn't buy it again.
Answer: yes