- Sep 20, 2013
It really depends on the flashpoint but thats usually not true. Most LEDs have a max Tj of way below 150°C which is no where near enough to burn anything.
LEDs can put out a huge amount of light so even though their emitting area is huge, they can still be used to burn stuff.
That really depends on what led and optic is used, High power phatlight or puny 3w cree xpg?
We could start calculating things, physics states: Conservation of etendue.
You can focus leds to even smaller spots than their emitter size area, it just depends on your optical system.
However you will decrease depth of field doing so.
Its a simple matter of beam parameter product, exactly the same thing that governs the focusabillity of lasers.
Yeah, I would expect you to try to change what I said as physically impossible, but that simply is'nt the case. You seem to think that powerful LEDs can burn at a distance. Proof it!