I had burned SST 40 in convoy S2+.
I open it and see that one of wires in diode has a break and I try to dedome diode and solder wire.
It works but only for 10 minutes and died again completelly.
I buy new diode at Simon store and it eorks now without problems.
no failed FL emitters, but dozens of failures in the 120vac LED bulbs.
On disassembly i found tiny black dots on failed emitters. So called longer life bulbs, but most failed in the first year, maybe 1 or 2 made it 2 years. Several had just one emitter in the series string let go, but some took out the entire string.
Older versions had transformers and circuitry, now there is just a diode bridge rectifier, a capacitor, 3 resistor pads but only 2 populated, and a Joulwatt JW1981 LED driver chip.
Last winter I cooked an XHP-70 in my 2 cell hunting light. It was really cold out and my daughter and I were cleaning a deer and it was our only light. I think it condensed going from the house out to the field and about 20 minutes in it just got dimmer and dimmer. The dome turned black and I shut it off because the output was so low.