STANDARD NEAT (EXTERNAL) SURFACE TALL TRUNK-CONICAL LAMPSHADE
Lampshades material will be chosen by each manufacturer.
Common or heat and impact resistant ( vandalproof ) and tempered glass,
clear acrylic or borosilicate; other kinds of suitable materials may be used,
depending on lamp wattage and duty conditions .
Interior surface of the lampshade may be optically designed .
For improving the Cutoff level of luminaire, a part of the lampshade's interior surface
may be dark or coated thus not allowing light emission in restricted angles.
The upper part of lampshade, more exactly, which covers the lamp
(bulb) glass, may be mirrored, resulting a lampshade with an upper reflector
obscure mirror glass.
