Brennenstuhl energy saving bulbs 4000k e27 brennenstuhl 1177390 p align left this energy saving bulb 20w 1200lm 60lm w e27 from brennenstuhl is a quality u shaped bulb fitted with an e27 screw cap measuring 136mm in length and class a energy efficient while offering 1200lm luminous flux plus a 10 000 hour lifespan p brennenstuhl 1177390 energy saving bulb 20w 1200lm 60lm w 4000k e27