... hall,toll station,ets.General purpose, simple-design lampshade, Highly efficient,evenly distributed lighting.No dark ... 44mm meeting with various lighting requirement without changing the lampshade.lampshade: Dia360 410 470 type: open, with net, ... source: self-ballast mercury lamp, energy-saving lamp, high pressure mercury lamp, Sodium Lamp, Metal Halide Lamp(Electronic box installed separately).