[time-nuts] Hi Power LED Light power supply...

[Chris Albertson]

On Tue, Sep 18, 2012 at 5:21 AM, Bob Camp <lists at rtty.us> wrote:
> Hi
>
> I suspect those same 120Hz sensitive people would not be able to watch TV or
> a movie :)....

In the old CRT type TV sets, the phosphor has some persistence.
Movies are modulated with a square waves, the frame blinks off and
goes dark then blinks on.   But the LED's brightness is fast enough to
track the sine wave and would be bright only for an instant with quick
pulses of light.

But just as bad as the flicker is that the LED is wasted and spends
most of the time being dim.

Power supplies are so easy to do that they are NOT the hard part.
With LEDS the hard part is the mechanical and optical design.  The
light must be indirect and defused and to do that correctly and
without much waste requires being creative and/or having some metal
working skills.

Chris Albertson
Redondo Beach, California