John Smith wrote:
"I have a high power LED flashlight. 5 superbright LED`s in the
element...it is bright. If I bring it near an AM radio, I lose all
reception."

I have a Timex Indeglow watch with a fairly dim dial illumination when I
depress the dialstem. It wipes out radio reception too. I suspect that
solidstate diodes are noidy devices. They are efficient though as the
light is not accompanied with much heat. As for diode noise, zeners are
often used as noise generators, are they not?

There are various ways to get an atom`s orbital electrons to move to a
higher energy level. You can throw a stick on a fire or aim an electron
beam on a CRT phospher.. From a laser, we`re looking for coherent
radiation.

Best regards, Richard Harrison, KB5WZI