Lasers, ARDUINO, CNC, RC helicopters, 3D printers
50mW 532nm (ripped from a cheap stage projector)
500mW 532nm (in the laser harp)
1W RGB (500mW-660nm, 200mW-532nm, 500mW-450nm) Touch the white beam and it is: "AUCH!!"
The white laser burned the paint off from the door!
I am thinking of starting a "door-etching-business"