This lens, from the Quadra Lite family, represents the fixed part of the ZOOM QUADRA LITE system and is to be combined exclusively with the CSQL4XR_ZM mobile lens, to obtain a variable aperture system from 12 ° to 45 °. The system is suitable for most LED sources with 1mm2 chips and with a primary lens. With different LEDs, but mechanically compatible, the ZOOM system opening range can vary.