I found these old pics from my ancient Geocities page - so they return again.....:
Xenon is a really fun game that has a clear "Tube Shot" that is lit by little 6v bulbs.
Because these bulbs have hair thin leads, they are always broken or just burned out.
A few years ago I was repairing a Xenon that had 1/2 the bulbs out and did not have any of those tiny bulbs in my box; but I did have plenty of LEDs. I figured that the LEDs would probably never burn out, and could be a cool blue color to match the blue pop bumpers.