Osram dsst mctw 7 w840 e27 4008321948960 the osram dsst mctw has a low energy consumption 7w and an average life of up to 10 000 hours the lamp has a very compact shape with high efficency so is most suited in areas that are hard to reach and also in small spaces other areas of application include high quality domestic and professional environments general illuminations and wherever light is required quickly the lamp provides a higher luminous efficacy and has extremely fast l