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Features of RC series LED downlights:High brightness Nichia LEDs as light source, high lumen output, high energy efficiency;Built-in thermal management system fully conducts heat away from LEDs to the surrounding environment;Come with high quality LED drivers to ensure high energy efficiency and longevity;Replace halogen downlights and CFLs directly;RC series LED downlights adopt advanced LED lighting technology of reverse polarity protection, constant current regulation, and special design for excellent thermal solution and lumen maintenance. Nichia LED Chips are used as light source, which ensures high brightness and low heat generation. LED recessed downlight has a lifespan of 35,000 hours which means 17 years at 8 hours a day, full aluminum alloy heat sink design ensures full heat dissipation. The 4 inch and 5 inch RC series LED downlights are TRIAC dimmable to 8%, and matching with the specially designed drivers, these lamps can be dimmable and compatible with most traditional dimmers, which means they can deliver a comfortable and proper light output that you desire and save your energy bills. Our LED ceiling lights are direct replacements for traditional CFLs, they are suitable for cabinet, restaurant, houses, villa, hotel etc.Technical Specifications:Lighting source: Nichia LED ChipsMeasurement: D4.5*CH3.9*H2.0inch (D115*CH100*H50mm)Lighting area diameter: 3inch (76mm)Cutting hole size: 3.9inch (100mm)Light lumens output: 400 lumens (3000K); 420 lumens (4250K); 440 lumens (5500K)CRI: 80 (Warm White); 75 (Natural White); 75 (Cool White) Typical.CCT: 2800-3200K or 3800-4000K (Warm White); 5700-6150K (Natural White); 6150-6500K (Cool White) TypicalInput voltage: 85-277v ac, 50/60 hz.Power factor: > 0.95Power consumption: 7W (luminous efficiency: 62 lumens per watt Typical)Fittings: No base.Lifetime: 35,000 hrs.Beam angle: 100°Heat sink: Aluminum alloy & optics frosted plastic.Light guide plate: Frosted PMMA.IP Rating (Working environment): IP20, indoor use, applicable for dry environment.Operating environmental temperature: -10°C to +40°C (+14°F to +104°F).Storage temperature range: -40°C to +85°C (-40°F to +185°F).Humidity (non-condensing): 5% - 95% RH.