... rate at 80% could assure hight brightness.2.External Power supply with UL, PSE, TUV,SAA,etc .3. ... 3 years warranty with original written warranty; 20,000 switch cycles(on/off switching).4, Recessed mounting available5.Low ... the LED panel light in case to avoid the power harm and body harm. When installing, please note ... consult a competent electrician or technician . 52w 5050 HI-Output S-Panel Light