we did it in a
pdq g-5. we used 2 288 watt rgb light bars from tss per bay. there is an old thread here somewhere on it. you need a different controller for each color you want to use. you hook them up to the outputs for the chemical solenoids so they turn colors on depending on the cycle being run at the time. unfortunately nothing is perfect as there is no solenoid for high pressure rinse so no color during that cycle. I still have my electrical schematic around somewhere if you need it.
I can tell you that after 2 years in the bays the led clusters have started to fail and all the heavy rubber wiring feeding it all has dry rotted and cracked. that is on the 288watt rgb lights from tss but I imagine it would be the same wiring for 288 or 144(??) we easily could have used the smaller wattage lights as they are very bright.
now we have green for the first 2
soap cycles and blue for sealants, multi for triple foam and yellow for hot wax and red during drying. they become quite eye catching at night and it is possible to wire them so they flash multi color when the machine is NOT in use for attention.