LED Apparent Brightness

In downtown Portland OR there is a billboard right by a major road that is made with an array of R, G, B *bright* LEDs. It has been in use for over a year (maybe longer) and was replaced and/or refurbished - it is brighter now than before. So, "prohibitively" expensive would not seem to be a factor..

Yes, I believe the one on/near 6th avenue just south of Portland State University, on the road going between there and Oregon Health Sciences University.

Jon

Just though of another purpose: the IR remote control. Here pulses (about 38KHz) are used by the receiver to distinguish the signal from the ambient light. Shorter bright pulses might even help in this respect to get further above the noise floor (if this is of any influence)

Just yesterday came this free LED demo board from Philips with tiny 3-colour SMD-LEDs. Those would really make something neat.

Spinning color wheel? Is that by CBS? Does RCA have something different? Do i add that to my brand new black and white television for color?