What this instructable does:
Take a regular PR 2 bulb with a P13.5s base (i.e. those most commonly in torchlight), reuse the base and insert 3 x 5mm diameter white LEDs. See image of end result below.
The shortcut to this project is to go into a shop and buy one of these. But hey, what's the fun in that when you can make your own!
Step 1: Removing the glass bulb
The glass bulb is fused to the metal base with a clay-like cement, and should crumble easily. Once the bulb is removed, use a mini screwdriver scrape the metal base clean. The internal surface wall of the base has to be electrically conductive.
What's left is seen in the image below.