I put two white zigbee smart bulbs in my hallway. Paired them up with the zigbee hub, added motion sensors, wrote a little automation script to turn the lights on when motion was detected. Only if the outdoor solar panel is reading less that a quarter watt.
Brightness was set to 127 (50%).
Everything worked... for 2 days, then together the bulbs came on at 100% brightness, without being triggered. I wasn't even in the room, but the hallway lit up really bright. Possibly more than 100% brightness. I power cycled them, thinking it was just a glitch. Neither came back on. They should always come on immediately when powered up. Closer inspection revealed both bulbs glowed dimmly. One more dimmly than the other.
Oddly the smarts where still somewhat working. When commanded it would respond, but the light wouldn't change.
I emailed them on Amazon and they asked for the invoice and sent replacements straight away. No quibble.
2 days later the new ones arrived and I swapped them into the system and the were back up and running again.
3 days later and while sitting in the living room, not in the hallway and during the day when they would not be turned on by the automatics, one of them start strobe lighting, rapidly and extremely brightly. After a power cycle to stop it, it strobed a little longer and then went dull dim. It has remained that way since. It talks to the Zigbee hub but doesn't produce light.
They seem to be one of the first to try and cram the whole LED driver AND zigbee chip inside just a tiny 10mm ring around the metal connection cap.
I should note these are B22 British Bayonet connectors.
So the failure mode and cramped space leads me to suspect it's a capacitive dropper circuit and the capacitor is failing, probably due to heat.
Do you think I should ask for more replacements and waste my time, ask for a refund or just move on and forget it?
Note, finding Smart devices that do not require an internet connection, an app or a cloud login, is quite hard. These were fairly perfect as I can control the Zigbee network ... if they lasted longer than a day.