In article ,
dennis@home wrote:


"Dave Plowman (News)" wrote in message
...
In article ,
dennis@home wrote:
What makes you think there's another way of doing it? Not a
knowledge of optics, obviously.

So do you know the difference between a filament and a silicon
junction?

LEDs don't need optics, then?

Stop wriggling.

Ok Dennis. Explain how you get a sharp cutoff on an LED without using
optics. My breath is bated.

Hint: Just how the light is produced - filament or discharge etc make
little difference. The more of a point source it is just makes the optics
easier.

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Dave Plowman London SW
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