Bbier Lighting 2×2 2×4 FT 20W to 40W 2700K 3500K 4000K 5000K Flat LED Troffer Panel Light, rectangular light fixture that fits into a modular Dropped grid(i.e 2 by 2`or 2`by4)Led Troffer fixtures have typically been designed to accommodate standard flurescent lamps(T12,T8,T5)but are now often designned with integral LED Sources.Troffer Retrofit is typically recessed sitting above the ceiling grid but are also available in surface mount”boxes”.BBIER Smart Technology intelligent light solution or continuous 0-10V dimming to 5% along with up to 130 LPW efficacy enables compliance with most nationwide energy codes.Troffer qualifies for DLC which enables enhanced rebates nationwide.Flat Panels and Troffers are LED lighting solutions that replace fluorescent fixtures in drop ceilings.Troffer lights are the obvious choice when it comes to installing lighting fixtures in hospitals, big offices and industrial environments.