MDAIRC UL 0 - 10 V Dimmable LED ceiling flat Panel Light 2 X 2 feet (24" X 24"), DLC Qualified Eligible for Nationwide Rebate Programs, 4940 Lumens, two lights in pack (40 Watts, 4000K) 0-10V Dimmable, The side light, the thickness of 10mm, DLC checking maker: CITYGHOST, Item No.: CG-PL40S2240Z Using 0.2W 2835 wafer chip lamp life &gt; 50 thousand hours A variety of installation: embedded (without accessories), lifting type (with lanyards), ceiling type (wall with frame), inhaled (required with smallpox box) Light angle: &gt;110 degrees, RA&gt;80, IP44, CLASS High efficiency constant current power supply, the efficiency of up to 90% PF&gt;0.9