LEDbulbs are compatible with existing fixtures with an E27 holder and are designed for retrofit replacement of incandescent bulbs.- Cap base E27 [E27]- Nominal lifetime 15,000 h- Switching Cycle: 50,000- Flux measurement reference: Sphere- Colour Code: 940 [CCT of 4000K]- Beam angle (nom.): 180 degree(s)- Luminous Flux: 1,055 lm- Luminous efficacy (rated) (nom.): 105 lm/W- Colour consistency: <6- Colour rendering index (CRI): 90