Energy Efficient Light Bulbs

[pimplyteen]

I've bought some today F rated, they claim to use 90% less energy.
Now I know many people believe that you save very little in the way of money by keep turning lights off, that is debatable I think but in the long run it's got to make some difference in my view and one of the 3 reasons I bought them.

The second reason was because I like a white daylight bulb.
The 3rd reason is really my question. On the box it states, " Lasts up to 15 years" If the bulb gives up after 2 years, do I have a claim? I see it that I don't because it has lasted (UP) to 15 years, if my thoughts are correct is the claim of 15 years miss leading and not worth a dot because I would have to in some way prove a manufacturing fault that would almost be impossible to do. Any thoughts? By the way I have no such problem at the moment. :0)

[Atheist]

Maybe best to ignore the purchase price (which will amount to almost nothing per day) and check out the Lumens per watt which the bulb will deliver. Lumens means brightness, and watts means power consumption (i.e. what your power supplier will be charging you on).
I'd be aiming for more than 1000 Lumens for a decent bright bulb. You can find more about Lumens' approx correspondence with old-fashioned incandescent wattage on line.