Wed Aug 09, 2006 1:58 pm
Blue light is more noticeable to the human eye than red.
Also stands out in background which is often red and clear lights.
Incandescents, even halogen, do not produce blue well.
LEDs blues are so rich and pure.
We only have red LEDs. Blues are too expensive.
Our LEDs have a clear case and black background.
This creates the best contrast when lights are off between flashes.
They turn on and off INSTANTLY.
They flash one second on steadily, one second off. But during the OFF phase they rapidly flicker at half the Opticom preemption frequency. Together they create the preemption frequency, which sometimes works some signals - but never the signal at a huge busy intersection with a 500 foot long median before the intersection - where we need it most.
One of our lightbars has 26, count 'em, 26 flash patterns!
It's a joke. Best is simply ALL ON/ALL OFF - ALL ON/ALL OFF.
The back LEDS can be an arrow stick.
But we never use them as such.
If we correctly direct someone, and they have an accident, they may blame and sue us.
Though we be right, we spend a fortune to win the case.
Moral: Never direct anyone. Just protect yourself.