Step 2: Opening the lamp
The lens is hold by a plastic translucent ring, which fits (snaps) over a white reflector. By removing the ring, the reflector becomes accessible and removing the led is then easy.
To remove the ring: Be careful, gentle and patient. Wriggle a flat screwdriver (or a blunt knife) in the slit between the rim of the silver colored holder and the translucent ring. Carefully lift the ring, until it snaps loose.
You need some (gentle) force and persistance to get the ring loose. If you'r unlucky enough to break the ring, you'll need to find a way to glue it back later on. Or buy a new lamp for five bucks :-)
The ring and lens are removed. The white reflector covers the white led.
Remove the white reflector by unscrewing two philips screws on the sides. The pcb becomes visible, on which the led is mounted.
Desolder the power wires from the pcb. Not a hard job, grab a wire with small pliers, and melt the solder around the wire on the pcb with a soldering iron. Pull the wire gently loose when the solder melts.
The pcb is glued on two ridges inside the lamps' frame. Wriggle it loose with a knife or screwdriver. You won't need the pcb for this project, so don't panic if you break it.