Hi,
I really don't like leds on EM's with results like that :
Led (resized).jpg

I'm testing this prototype made by a friend of mine on a Mad World Bally. Works for EM or SS pinballs (AC or DC current). One model for lamps that go through the playfield, one for insert lamps.
Almost no difference with original lamps.
And you don’t need a (F.. on Bally) lamp socket anymore…
DSC01296 (resized).JPGDSC01300 (resized).JPG
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DSC01303 (resized).JPG

I've asked few friends to try to locate the only 2 leds I've installed on my Mad World and none of them found the 2 leds.

There is an exception on Gottlieb EM pinballs. 6 V lamps that are on the 24 Vac circuit with a resistance in serie. #47 bulb will not work. Must use a #44 !
On a Cleopatra EM for example:
Image1 (resized).jpg

I agree with you for EM Christmas trees, no way !