Roff
Well-Known Member
Do a Google search on "coherent light".epilot said:Nigel Goodwin said:It's not just an LED, it's a Laser Diode, these produce coherent light, which the lens can then focus - a normal LED (or lamp) produces in-coherent light.
i can not understand you!
what "coherent light" means here?
do you think a common led can not be so focused to go very much destance?...