Hi Fracster,
I have not yet got the infrared LEDs, however all I was going to do was order them online from either RS, Maplin's or Farnell components. What I was going to do is just drill a very small hole into the sidelight lamp casing and epoxy resin the LED into the hole, then put a quick connect in the cable, to allow changing of regular bulbs easily. Unless you know of a better method ?