Easy Installation Step1. Cut off the power supply. Step2. Remove the lamp socket(s) and BALLAST. Step3. Choose one installation method suitable for your fixture. Dome(not for 3 inch light engine), junction-box or surface mounting. Step4. Connect wires, white to white, black to black and ground to ground. Much more detailed installation information could be found on user manual comes with each item.Long LifespanSilverlite LED light engine is rated at 40,000 hours. It is 4x longer than CFLs(10,000hours) and much longer than incandescents, meaning far fewer service cycles and far fewer replacement bulbs.Excellent Heat ManagementBacked with a tough steel heat sink, Silverlite LED light engine has better performance in heat dissipation, which allows delivers longer life than other LED module. Rugged design bulid to last.5-year Limited WarrantySilverlite LED light engine backed up a 5-year limited warranty from the purchase day, guaranteeing the need for minimal servies or replacements.Totally Flicker FreeFlciker Rate <30% @ dim to 20% lumen output UL ClassifiedSilverlite LED light engine are UL approved for use in luminaires and suitable for damp location where not in direct contact with weather and water, can be used in bathroom.Specification:-Size: Overall 8.39", PCB diameter 7"-Power: 28watt-Output:2x75watt incandescent2x18watt CFL1x32watt T9 circline CFL-Voltage: 120V-Control: Triac Dimming-Brightness: 2450lumens-Color Temperature: Cool White(5000K)-CRI: 80+-Operating Temperature: 0°F to 104°F.