There should be a rung in the base of the wall ceiling lamp that was originally installed on the wall (we call it a "pillar"). If it is installed on the wall, the rung should be installed first, and then the wall lamp should be screwed fixed on that rung. If this is the case for your wall light, you can first fix the rung to the glass with glass glue, (the glass glue should surround the rung, not just the bottom) and wait two days (or longer) for the glass glue After the intensity is reached, the wall light can be installed. The firmness of the glass glue on the glass is still good. (This one does not damage the glass) For low-viscosity adhesives, it can be sprayed with ordinary paint spray. For those high viscosity adhesives with short pot life and difficult cleaning, sprays from Burt can be used in the reinforced plastics industry. The advantage of the spray method is that the glue is applied evenly and the work efficiency is high; The height of the general wall lamp is 1440-1850mm from the working surface (referring to the horizontal plane 80-85cm from the ground).