The PS-4 utilizes a SoLux MR16 halogen lamp, the spectral power distribution of SoLux™ is identical to daylight across the visible spectrum. The result is true color rendition of everything from sparkling jewels to clothing to sensitive art collections. The beam uniformity of SoLux™ is unsurpassed. Other MR16 and incandescent reflector lamps emit uneven or splotchy intensity patters which distract the eye and change the appearance of an illuminated object. SoLux's™ patented technology results in larger reduction of infra-red rays, up to 80%, when compared to standard tungsten-halogen lamps.