... High efficiency,high reliability and low power consumption.Excellent up to 80% energy saving, green light protect environment..No ... Aging test, Twisting force testing,Lumen testing; lifetime: 4 years (8000hrs)4. Working temperature: -10 ~+50°C 5. Pricing ... strict quality control& inspection though every process of production. 4. Competitive price, superior after-sales service, professional technology ...