I bought this LED bulb about 21 months ago for €11.99.
I liked it!
Now, you’ve certainly noticed that I used the past tense in the previous sentence. It failed a couple of days ago. Today I tried to have it replaced at IKEA, but they refused. Yes, there is a 24 month ‘warranty’ in the EU, but the WEASELS have ways to wriggle out of that. At least if you don’t want to involve a lawyer over just 12 bucks.
How long did it last? Well, less than 24 months, duh. If I use a conservative estimate of about 1-2 hours of operation a day, that translates into somewhere around 1000 hours. A surprise, maybe not. Very far from the numbers usually claimed, which are in the 10’000s of hours.
This bulb was marketed as a 60W equivalent. With a kWh price of about €0.26, the bulb has payed for itself, barely.
Symptoms: excessive heat, shuts down on its own (presumably over-T protection), very bad smell emanating from the bulb.
I didn’t manage to remove the LED carrier, too much epoxy.
Texas Instruments TPS-92070-based. Interesting thing, using isolated current sense feedback using a small transformer.
It looks like there might be a crack in the capacitor, but it’s OK.
The large transformer is used for DC/DC conversion, the small one provides isolated LED-current feedback. See the datasheet for some details.
I suspected a blown capacitor, but I didn’t find any of that! Except for the bad smell, I didn’t find anything obvious. Fortunately the LEDs are still OK (350mA-ish @ 16V-ish). The lamp should take 8.1W. The power-supply has an efficiency of about 80% (see datasheet), the LEDs should take about 6.5W (about 400mA). The current-sense resistor of 240mOhm + the current-sense threshold voltage of 100mV give about 417mA, looks OK to me.
I’ve removed the E27 connector, just to be on the safe side. The hole at the bottom will come in handy for adding a barrel connector.
I think I will convert this bulb to a low-voltage lamp at some point in the future – using my favourite PT4115 constant-current LED driver with an external power supply. After removing the old power-supply, there is enough room for adding a small circuit board with that driver, a micro and maybe 2 buttons for brightness control.