The round shape leads to a very good illumination of the ceiling. The brightness is sufficient, but less bright than a violent halogen uplight conventional way. As I had expected something more. However, the power savings also enormous (18 watts to 300 watts).
Also our visitors jumped the quite original aesthetic way, the eye. In our living room it goes well.
Too bad that in the type lamps the lamps is not replaceable. Here it must be found in the future a solution.