Cwlondon, I have the Yamaha C4, C6, and M4 amps. Those lighted switches are frosted clear plastic with a hole in the back of them for a small white light bulb (not an LED). The color glow of the switches comes from colored rubber covers (yellow and green)that fit over the bulb. This button also pushes the actual electrical switch behind it.
On mine, I left the lights as-is on the M4, but replaced the ones on the C4 (three of them) and C6 (two) with Blue LED's. Way Cool.
Try a search on eBay using "Blue LED" (or other colors) - you may find something to your liking. There is a lot of lighted LED switches there, but mostly for Automotive apps.
Lastly, its good to know that I am not the only one who likes lights on equipment.
On mine, I left the lights as-is on the M4, but replaced the ones on the C4 (three of them) and C6 (two) with Blue LED's. Way Cool.
Try a search on eBay using "Blue LED" (or other colors) - you may find something to your liking. There is a lot of lighted LED switches there, but mostly for Automotive apps.
Lastly, its good to know that I am not the only one who likes lights on equipment.