So far I have been doing all my testing with high output red LEDs simply because I had them lying around after my monome build. Today I did some quick tests with other colours and realised the impact that this decision will have on my final product.
Aspects such as wavelength, intensity and viewing angle are all important factors when choosing LEDs. I had a similar issue with my monome build but the forums had plenty of discussion on the topic…now I’m all on my own! At the moment I’m leaning towards amber/orange for its warmth and high output per Watt. Light around the red/orange portion of the visual spectrum also happens to be optimum for visibility in low-light conditions (hence its use in street lamps).