Thanks to everybody for all the answers! -I'll do a tear down when I have more time towards the end of the year and take it from there. Seems like simply adding a color "filter" might be the quickest first experiment for me. The main question I'm left with after reading your input is how effective the light guide can function with specific areas of the spectrum. I work with component level electronics at work, so the prospect of maybe changing out the led hardware is an option I'll keep open...