I fitted a 4-way LED spotlight in my nephew's kitchen yesterday. I actually bought it 6 months ago to use in my own kitchen but I am still waiting to have the ceiling replastered so I thought he might as well have the use of it.
When I switched it on there was a bright flash, sparks flew across the ceiling and the lighting circuit breaker flipped!
I had been really careful so I was 'somewhat surprised'. All I could think of was that one of the LED lights must have popped. I removed all of the lights, reset the circuit breaker and switched power back to the spotlights. No problem. I then put the LED lights back in one at a time and each one worked! I ended up with all 4 spotlights working ...
Anyway, despite the fact that all now seemed well it probably was not a good idea to trust that light so it needed to be returned to the supplier. I had lost the receipt but I solved that problem by buying an identical light from the same shop, swapping them over, and then returning the original light with the new receipt.
The old light showed no signs of burning, no obvious damage. all the LED lights worked. The only thing that I can think of to explain the problem is that a piece of swarf must have got inside one of the light fittings during manufacture and that shorted the power out when I switched the light on. The burst of current before the circuit breaker flipped would have been enough to vapourise the evidence.
After that I replaced a nasty light fitting in another room with a simple one suspended one from a ceiling rose.
And finally, I put a nice chunky new curtain pole up to replace the ugly scrawny one that was there before.