Re: Driving large numbers of LEDs

[neon]

the amount of LEDS to be used is depended on power available from 120V AC and a diode you can drive at least 90 or more in series asuming a 2.5v each. then you can add more and more as you wish until the wires burn up.
LEDS unlike lamps the brightness sepends on current and a minimum of voltage present. i supose a triac and a photo triac interface can be used to vary the light output from the string of LEDS. i did something like this last xmas it is not as good as lamps though. good luck.

 

[Eeyore]

I have a new client with an interesting product. They are driving
large quantities of LEDs (in the hundreds, with future products to
be in the thousands) in banks of red, blue, and green (with, of
course, different voltage/current requirements for different
colors). They want be able to dim each color using a microcontroller
-- PWM is OK as long as the human eye doesn't see any flicker.

Fascinating. I know someone (family actually) intending to do something
very similar.

Graham