Our friend and fellow open hardware advocate, Jayson Tautic of Tautic.com is offering a cool breakout board on Tindie that word clock makers might want to take a look at. It is a break out board for the TCS34717 – Color Light-to-Digital Converter.
ClockTHREEjr has a light dependent resistor or LDR board to measure brightness. The problem with all of the LED switching taking place on the board, the analog measurement gets screwed up. This breakout board could be the answer. Besides measuring RGB color intensities, it also give an overall brightness reading which could be use to dim the LEDs when the lights go out.