Just by dumb luck, I changed some light bulbs today. :laughing:
On one bulb I did not write the date and it was in a fixture that is not often used so I think that CFL was from 2004. :shocked: I replaced it with a cheaper spiral CFL and the new bulb did not work nor did the second one. :confused3: After spending 2-3 hours trouble shooting the circuit it looks like the conductor that hits the tip of the bulb was bent so that it cannot connect to the bulb.

Spent quite a bit of time getting the conductor to bend back but still the bulbs do not work even using known working bulbs.

I did notice that the older CFL conductor tip was a bit longer than the new spiral bulbs which I think bent the fixture's conductor.
Anywho, I replaced two other R40 bulbs, one was a GE was 2.5 years old and one of the original Lowes, the first Lowes CFL were pretty good, was from 2009 so about 4.5 years old.
I put the bulb I thought was bad into another fixture and it still works. I think that bulb is about 10 years old. I still have 6 of the HD bulbs we bought in 2004.



I might try one of those bulbs in the "broken" can fixture.
I have not had a problem with CFLs being dim at all but one does have to pay attention to how many lumens the bulb produces. Some of the bulbs take a while to warm up but that does not bother us and in fact we like it. It is nice in the morning to not have a blinding light blast you awake. This is not so good if you have the CFLs in flood lights for security though some of our CFLs don't seem to have much, if any, light lag.
Later,
Dan