PAR bulb
A parabolic aluminized reflector bulb of cast glass for incandescent and high-intensity-discharge lamps, having a precisely formed internal reflector and a lensed front to provide the desired beam spread. (Ching, 1995)
A parabolic aluminized reflector bulb of cast glass for incandescent and high-intensity-discharge lamps, having a precisely formed internal reflector and a lensed front to provide the desired beam spread. (Ching, 1995)