would using rgb leds and a adjustment to change colour be too expensive?
The LEDs I am having custom made are only 1.5MM in diameter (white) - to fit three chips in this package (R,G & B) AND then have 4 legs on each device takes the leg count from 8192 legs (in the product as it stands) to 16384 with RGB LEDs - I don't think they would pysically fit on the board???
Then you have to multiply the driver circuitry by three as well - again, I doubt all the chips needed would pysically fit on the board as it is - it could be done with a seperate stand alone driver board.
Doing this would multiply the cost of the product by many times and decrease the reliability.
The only way it would be marginally economical (or even physically possible) would be to use surface mounted RGB LEDs and that is not where I want to go because the product then becomes throw away.
Much easier and FAR cheaper to clip on a coloured filter.
