I was forced to return this item. On the one hand there is a tendency to believe that the surface is glass ... then it is a wire mesh (white metal) "wrapped" around a plastic bubble. Perhaps kindled, this luminaire looks like his photo, but off, it is downright ugly ... :( But most important is that it can not be installed on a standard 80 mm housing PL !!! The small metal bar grip offers two holes for the screws ... but on a case PL these are totally in a vacuum. Too bad though ...