I have been very happy since I got a new replacement lamp for the air purifier and it is running in the living room. It's very pleasant with this good air.
It's great, discreet and I suppose efficient...hard to measure! And very pretty...
When ordering, there should also be the option to order one or more UV lamps as a reserve... Since I can't find these, I have deducted one point. I always have the device in operation... you can hear a slight noise.