On Thursday 18 March 2004 05:58, William Chops Westfield wrote:
> On Wednesday, Mar 17, 2004, at 15:59 US/Pacific, Byron A Jeff wrote:
> > Now with the single segment getting 80ma at a 1/32 cycle the average
> > cycle is 80ma/32 -> 2.5 ma
>
> Don't forget that psychological effects enter the picture at some
> point.  An LED pulsed at 8x current 1/8th of the time LOOKS brighter
> than one just getting 1x current continuously.  (I don't recall whether
> that helps with things like daylight visibility, or whether it's just a
> perceptive phenomenon.)
>

Depending on the LED construction, the luminous intensity goes linear,
exponential or piecewise decreasing linear with current. Look at the curves,
for example, in this datasheet: (luminous intensity vs. forward current)
http://www.avc.ru/binaries/16395/TC1211HWA.pdf
So, depending on the LED type, pulsing with 8*the current with 1/8 duty cycle,
will give a higher, equal or lower luminous intensity :o)

All depends on the specific leds inside.

Koen

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