(oh yeah, they had unlit switches back in the day, but they were actually opaque black plastic as opposed to the lit clear red plastic ones..)
Asteroids, etc... used the lit red ones, so they would flash on coinup.
Missle Command generally used opaque black ones, but they were often replaced with whatever was handy when they went out.
Midway also had their version of the lit ones, used on Omega Race, Discs of Tron, etc...
They had shorter cones than the Atari version though.
Xenophobe had a mix of red ones with/without the LED inside.
The ones that didn't have the LED inside are a translucent red, vs. the transparent red of the lit ones, so they aren't quite as dark as the true lit ones.