First step is to take the old fixture out. You can do that by unscrewing all the mounting screws. This is the time to inspect the lamp and see if you can find the voltage and power of the transformer. Luckily for me, this lamp was 12v and 20w, which is perfectly within working range for the Cree 3W Dimmable LED Puck Light
. Notice that my lamp transformer works in A/C and usually with LEDs' you will need to use D/C but the puck I am using has a rectifier so it is irrelevant weather you use A/C or D/C.
If you need to use D/C you can follow these steps but in addition you have to swap our the original transformer for a D/C power adapter like our 12V adapter
and wire it to the switch of the lamp.