This problem is very common among GE8 users. The original light using regular tiny bulb covered by colorized rubber. I fix mine after my neighbor asking the same repair.
To access the switch:
- Open the head unit
- Release the switch by pressing the switch’s side clip using screwdriver, and push thw switch out
To replace the bulb using 2mm strawhat LED and 820 Ohm resistor:
I think pictures speaks louder than words… 😀