It's not the temperature that. The melting temp of any material can be looked up. It's how long you can *sustain* that temperature in your saver. The evaporation energy of the metal is drawn out of the saber and needs to be resupplied in enormous rates to be able to 'cut' fast. I do this for my work, metal sheet processing with lasers. We are very happy to be able to cut a centimeter thick metal sheet at several millimeters per second. We need a 1 kW laser for that, and the cut is only a hair thick. The laser light density is > 1 Giga Watt per square millimieter. If you want to cut wider and/or faster, no need more power. So with the light saver you'd need a small 1MW nuclear reactor strapped on your back for day-to-day use!