The Source Four PAR and PARNel feature a rugged die-cast aluminum construction and the acclaimed Source Four lighting technology. Source Four delivers a smooth even field, and at 575 watts is comparable to a 1000W PAR64 - while saving 40% on energy. Changing beam angles is easy; Source Four PARs come with a set of four snap-in lenses that mount in a rotating ring. PARNel, with its wave lens design and focusing knob, lets you access a range of 25º to 45º, providing a soft, symmetrical spot or flood like a fresnel. For use with 375W, 575W or 750W lamps.