Yesterday I got tired of buying new batteries every other week for my bicycle lamp.
It's one with a conventional light bulb, hence it literally sucks the life out of batteries.
I didn't really want to spend more money and buy myself a new LED light since I already have one. So I took matters in my own hand and decided to hack my existing light by upgrading it with three LEDs.
Step 1: Materials Used
The theoretical considerations are the same for all types bicycle lights.
In addition I used three white LEDs to replace the built-in bulb.
For soldering purposes you'll also need a soldering iron (basic soldering skills should suffice).
Step 2: Under the Hood
In my case, dismantling was a breeze: once the battery compartment was opened, the other parts were easily accessible. Nothing was screwed or glued to the reflector.
I took everything apart, until I had all the pieces lined up. Once I could see the PCB, I started working on the LEDs.
Step 3: Putting Everything Together
As a final step I assembled everything back together and fired it up :-)
As a further improvement, I'm thinkimg about building an induction dynamo circuit to completely get rid of batteries ...