On Friday, 4 October 2019 16:34:01 UTC+1, Commander Kinsey wrote:
On Fri, 04 Oct 2019 16:28:06 +0100, whisky-dave wrote:


I just tested one of mine with a meter, and it gave a power factor of 1.00, at 256V, 9.8W.


I doubt that it's just the LED, you shouldn't include the PSU in such calculations especailly if running off mains AC, because you're including the LED+PSU so not really gettign any info about the actual LED.

Why should I not include the whole unit? Surely that's all that matters.

That depends on the statement yuo wish to make.
If you want to test the power factor of an LED then that is what you test for.
If you want to test the power factor of an PSU then that is what you test for.
otherwise the test is pretty meaningless.