In article ,
Andrew Gabriel wrote:
In article ,
Andy Burns writes:
wrote:

You can make isolated CR PSUs by starting with 2 mains transformers
back to back. But really if it runs on 90v it should use earth &
proper insulation.
I hadn't appreciated what voltage it must have been running at until it
died and I dismantled it (30 white LEDs in series at ~3V each) no
markings on the PSU, but I notice the output smoothing cap is only 50V
rated, so probably explains why it only lasted a couple of years.

What makes you think the LEDs are a single series chain?
Often there are two or more series chains on the tape,
connected in parallel, so the driving voltage is lower
(or variations such as adjacent LEDs paired in parallel).

I had a GU10 LED explode. It was definitely series wired.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle