What are PAR lamps used for? What sizes to PAR lamps come in?

PAR type lamps are high quality lamps that offer a precise ray of light to shine from the bulb with even light distribution. For this reason, they are very popular for use in stage and concert lighting, where a strong beam of focused light is required. They are also used in the home environment to create strong spotlight effects. PAR lamps come in many sizes ranging for PAR 16 to PAR 64, to provide a variety of beam diameters.