I had some hyperflux LEDs lying around that allowed me to get high and low brightness out of one led with still plenty of light in both modes. A switch was added to choose the level of brightness.
Step 1: What do you need?
- A foldable magnifier (mine only cost € 2.50)
- A hyperflux LED with 3 'LEDs' in it.
- 3 x 150Ohm resistor
- A powerconnector
- A single pole, double throw tumbler switch
- A bit of protoboard