There's no such thing as an RGB laser. You could swap it out for a green one if you want it to be brighter, but don't put anything above class 2 in there if you value your eyesight--the pinball presents an eye hazard otherwise.

You can't get a 405nm (violet) or blue laser bright enough to look good without being dangerous. Your eye's response at that wavelength isn't good enough to make the starfield effect at a safe level of light.

There was a brief fad for blue laser pointers amongst laser physicists until everyone realised that they were really terrible: you could either worry about putting someone's eyes out/violating the law or have a totally lame pointer.