1224 hours (=51 days) ago, I bought an LED household bulb that I am running 24/7 since that day.
When I first switched it on, I felt it was really bright but over the weeks, it dimmed. At least I had a notion it did. Recently I felt that it was pretty much on one level with some of my keychain flashlights, so that I ordered a second one of these houshold bulbs, same spec.
I put them both side-by-side. Here are two shots with different exposure:
Observation: The new bulb (left) is so much brighter than the used one (right), it appears that the used one is not even on. Yes, it is on and I swear its initial brightness was impressing like the left side bulb. I consider this the end of the "useful life".
The used-up bulb has spent all its life mounted upright in free air in a cool hallway.
These bulbs are branded "Lunartec" and I bought them at Pearl.
One has an E27 base, the other one an E14 base, but the specs are the same: 24 LEDs, cold white, as bright as a traditional 25W bulb, power draw 2W, 100000 operating hours.
I'm pretty much disappointed. I got 1.2% of the advertised lifetime and most of the bulb life it was below the advertised brightness.
The shop advertised these bulbs as being very economical, which is just not true. They cost EUR 9.90 each, lifetime was no longer than an incandescent bulb where I get a 5-pack for EUR 2.
What is your experience with LED household light bulbs ?
Is there a brand that is confirmed to achieve the advertised runtime ?