4-Pack ASD 2x2 LED Edge-Lit Flat Panel 27W Dimmable 3500K (Warm White) Commercial Grade UL Listed, DLC Certified MADE OF HIGH QUALITY MATERIALS: a rigid frame will not allow the panel to bend over time, the lens is made of PMMA (transparent glass substitute) and will not yellow over time. Even in five years the fixture will look exactly the same as the day it was installed. DIFFERENCE BETWEEN EDGE-LIT AND DIRECT-LIT PANELS (both are offered on Amazon): edge-lit panels have a smooth lens uniformly lit all over the surface, direct-lit panels have a prismatic lens and rows of LEDs instead of bulbs. EASY TO INSTALL; RECESSED, SUSPENDED AND SURFACE MOUNTED OPTIONS ARE AVAILABLE: Standard application is T-Grid, all accessories are included. Three alternative mounting options are available: suspended, surface and sheetrock flush mount. PLEASE NOTE: accessories for all mounting options excluding T-Grid recessed mounting should be bought separately. MEETS USA QUALITY REQUIREMENTS, ELIGIBLE FOR REBATES, UL LISTED AND DLC CERTIFIED. UL listing means that product was tested in US authorized facilities and fully complies with UL electrical code. Ideal for both residential and commercial installations. DLC certification makes the product eligible for energy saving rebates (for more details, check your local state policies or consult with your electrician). FULLY DIMMABLE: high quality driver provides smooth 5-100% dimming (opposed to step dimming suggested for lower quality drivers that allows only a few dimming options (e.g. 25%-50%-75%-100%). The product uses a low-voltage 0-10V dimmer (manufacturer tested dimmers include: Lutron NFTV, Leviton IPL710 DLZ, Leviton IPL710 DL, Cooper SF10P-W). Please note: dimming is optional, if this feature is not required the dimming wires can simply be capped off and the light will function on/off. WARRANTY AND TECHNICAL SPECIFICATIONS: 100,000 hour LED lifetime, 5-year manufacturers warranty, 3500K color temperature (warm white light color), 2970 lm luminous output (the amount of light produced), 27W (efficiency), 100-277V operational voltage range. Additional technical specs can be found in the table below.