... time 4hEnvironment ProtectionROHSSafety CertificationCE,PSEWorking life50000hFeatures:1.Energy efficient(high energy saving)---To use LED light lasting for one ... About 90% of the electrical energy into visible light7.High safety factor---Required samll voltage and current,lower heat, ... working daysApplication:product is E27 screw-mount LED emergency lampUse in Home, hotel, conference, office,etc....