... light recession, good choice of daily lighting4) Protecting brightness, prevent short sight5) Long service life, 6000-8000 hrs6) wide work voltage ... % energyColor rendering index(Ra)>80Power factor>0.5 enOptional lamp base: E14, E27, B22More compact size by special designFlicker free instant ... Lamp/ESL/CFL 5w-135w Efficient and Durable Lamp/E27 Base Power Saving Lamp