Work Theory: The emergency ceiling light refer to electric resistance and household appliances internal resistance,identify circuit and intelligent emergency circuit to work commonly. Full electronic control, contactless, low power consumption and high quality. Applications: Widely used in household,office,shopping plaza,supermarket,school,hotel,restaurant,underground passage,boat, municipal engineering etc. Specifications: 1. Voltage Range: 90V~250V 2. Emergency Time:different product specs can keep 3~8hrs 3. Epistar led 4. Warranty:2 years 5. Package:1pcs/box Input Power 90-250V Color Temperature 3500K-6300K Life Time 50000H LED QTY 3PCS Power 3W. 1pcs/white box, 60pcs/carton.