On 4/23/05, Robert Rolf wrote: ... > I think the important issue about reading LEDs is to have a clear > contrast between light and dark states, and broader spectrum > (yellow green rather than pure green) to address color blindness > issues. Ideally, you have indicators that are UNIcolor and only > light for ONE state, rather that trying to multiplex the function. > e.g. Power led on monitors, green=on, yellow=powersave, red=standby/off > A R-G color blind person would have a difficult time distinguishing red and > green states. > > Robert Ive seen some red-green LEDs that I have a hard time telling the difference between green and yellow states. And some others are more orange than yellow, and you cant tell if it is in red or yellow state. And I have "normal" vision other than some near sightedness. So yes, avoid R-G tricolor LEDs if at all possible. Jonathan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist