Bulb screwed into the existing lamp (upright) to the wall. Light did not work, even though it was completely dark. Bought hanging lamp with clear glass, the light came on only if you held a few centimeters in front of the hand. The LED light is out there big cheese. In the house screwed in total darkness only in one version it funkionierte, but not in the promised on the description distance. For us out thrown Geld.i