Heat and light are exactly the same thing. Heat is just longer wavelength electro magnetic radiation than visible light. UV is shorter wavelength EM radiation

Heat and light are exactly the same thing. Heat is just longer wavelength electro magnetic radiation than visible light. UV is shorter wavelength EM radiation, so same thing (not quite sure why we are talking about sunburn though). It outputs a bunch of other EM radiation too. That's what an EMP explosion is - one desiged to maximize EM radiation in frequencies likely to destroy electronic equipment. I sort of assumed people on HN knew this.