2-stage optics combine high efficiency, long life and excellent color, Full vocabulary of distributions including open, lens and wall wash, LED array conforms to Zhaga standared for interchangability, Continuous dimming from 100% to 1% with 2-wire phase cut control, 120 - 277V constant current driver provides noise free operation, Collar adjusts 1/2" - 1", extended depth collars for 2" thick ceilings, Installs with captive, pre-installed bar hangers or butterfly bracket, Bar hangers adjust up to 24" and have integral nail and tee grid clip, cULus listed, Non-IC, thermally protected and ASTM-E283 airtight