[BrendanP]

Does anyone have experience of replacing these bulbs with LED bulbs? The bulb is 8W but these seem to be difficult to find and expensive, as it's a weird rating. Most festoon bulbs are 5W or 10W. I'm guessing 5W is too dim and 10W could overheat the fitting.

Attached is a photo of the lens cover which can be removed by opening the sunglasses holder and pulling down on the front edge of the lens. You can see the hooks at the back edge and the springy prongs at the front. DON'T try levering the cover off with a screwdriver along the sides or rear edge as you can snap off the hooks or the pegs they fit over.

[The Gonz]

There are loads of festoon LEDs of all sizes. I hit eBay and look for something that promises to give a cold white light. Wattage won't really be a concern once you move to LED.