Check the listing for details. 4000lm 2 Pack 27W LED Light Bulb Energy Saving Efficient 5000K Daylight LED Lamp. Condition: New. Listed at 38.29 USD. Bright & Efficient: Compared with other LED bulbs, SANSI's highly efficient light bulbs can provide 4000 lumens using only 27 watts of power, equivalent to 250W incandescent bulbs. Based on 3 hours per day usage, save up to 90% electricity, annual estimated cost $2.41. Flicker-Free: Adopting high light transmission optical lenses, up to 156 LED chips can not only provide you and your family with the light source they need daily but also provide a healthy living or work environment. No flickering, no noise. Patented Ceramic technology: SANSI's patented technology replaces the traditional Mcpcb aluminum substrate with a non-conductive ceramic heat sink, directly soldering the LED chip on the ceramic heat sink, effectively reducing the systematic thermal resistance between the LED PN junctionSANSI 2 Pack 27W LED Light Bulb 4000Lumens 5000K Daylight LED Lamp Energy Saving Description: Bright & Efficient: Compared with other LED bulbs, SANSI's highly efficient light bulbs can provide 4000 lumens using only 27 watts of power, equivalent to 250W incandescent bulbs. Based on 3 hours per day usage, save up to 90% electricity, annual estimated cost $2.41. Flicker-Free: Adopting high light transmission optical lenses, up to 156 LED chips can not only provide you and your family with the light source they need daily but also provide a healthy living or work environment. No flickering, no noise. Patented Ceramic Technology: SANSI's patented technology replaces the traditional Mcpcb aluminum substrate with a non-conductive ceramic heat sink, directly soldering the LED chip on the ceramic heat sink, effectively reducing the systematic thermal resistance between the LED PN junction and the surface of the heat sink, resulting in faster heat conduction and higher product reliability, making SANSI's bulbs perform with higher light efficiency. Safe and Reliable: The lamp body is made of special ceramic material, and the flame retardant grade reaches grade V0; the reinforced insulation structure means no risk of electric shock, its safer; the whole shell material reaches the WF2 anti-corrosion grade, which is more reliable and long-lasting ; The hollow design is good for heat dissipation. Guarantees: ETL listed, quality and safety verified, 22.5 years LED bulb lifespan, 5 years warranty.