I'm impressed that he was wearing a welding mask, although I wonder if he checked what the tranmissivity of the mask was at the light spectra he is generating. I remember putting a black baffle on my robot's IR sensors, only to review it with a IR sensitive camera to find out the baffles were practically transparent to IR light (great with blocking visible light though!)<p>I remember chemistry sets being regulated into non-usefulness, I wonder if that will happen with electronics.