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I did wonder how units with a "focus" option, functioned as neither of mine have that ability. But as they were purchased for lighting areas being serviced whilst underneath an electric tram, all...

Ahhh. Another good point.

I have ordered the heat sink compound which I will apply and also 4 replacement emitters in case it all turns to custard. :>)

As with the lemon, I will just have to...

Good point, I will do that.

I did some Googling on the Cree operating voltage and it seemed to be 3 to 3.7 v. This caused me to check the power they were getting and I attached a multimeter to...

Well, that did go well and the -ve was on the 3 wire side.

QUESTION.................When you say,"...I do it all the time." is that because they are:

a...detaching all the time? or
b......

Ahhhhhhhhhhh has now been superseded by " Gosh, Golly"

The washer was a spacer and I see now that what I thought was one sealed unit is just an enormous heat sink. Which obviously didn't work in...

Again, Ahhhhhhhhhhh.........Thank You

If I understand you, the white "washer" looking device in cree3.jpg, pulls/ screws/ levers out to give access for removal of the PCB below?

...Ahhhh.........

Thank you for your method, but we are speaking of "apples and oranges"

I agree, the task of re soldering or replacing a LED with wire "legs / connections" is simple.
The...

Oh, You interest me strangely.

Please extrapolate.

Be careful not to give the unit a knock after a period of usage. I did when putting it on the bench and the solder holding the light emitter to the circuit board failed (probably soft after being on)...