Probably a failure in the psu section, ie its running on ac or something
like that due to a bridge rectifier failure or they are wired opposite way
round and only half are on at once so one leg fails and only half the leds
work.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Dave Liquorice" wrote in message
idual.net...
10 W LED flood light has gone remarkably dim. Used it the night
before last and it was dim but just about gave enough light to avoid
falling over the cars putting the rubbish out. Last night next to
useless.

I'd expect failure modes of mains LED devices to be of the it works
or it doesn't variety rather than just dim. It takes a while to start
(there always was a very short delay) and slowly fades out when
switched off. High resistance between the PSU and LED module?

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Cheers
Dave.