Step 1: Obtain materials
2. LED Lamp, from flashlight, I used (G15654)
4. Wire, solder, etc
5. Tools, drill, knife, screwdriver
1 and 2 have part numbers from the electronic goldmine.
Step 2: Take apart the solar lamp
There are 3 screws holding the 2 halves of electronics enclosure together, the transparent dome pops off easily.
Step 3: Add your lamp in place of exsisting LED
Be sure you have the polarity correct when you solder the leads of your lamp to the leads where the first LED used to be!
I covered the soldered connections in hot glue after I was done.
Step 4: Expand/Add hole for mounting to bike
Step 5: Cut and epoxy lamp to solar lamp unit
I set the lip of the lamp into the notch and epoxied it there, I also added epoxy to secure the wires and the LED's PCB.
Step 6: Mount to your bike!
Use a screwdriver to tighten and loosen things and position the lamp to your liking. I found that when riding, the circuit turns off the light when under a street lamp.
Have fun, be safe, wear a helmet yada yada...