Diffusers are a glass "bowl" which forces the light
upwards providing bright, indirect lighting to illuminate a room.
Diffusers are also called the I.E.S. reflectors because of the development of Illuminating Engineering Society (I.E.S.) standards which encouraged better lighting in America through higher wattage output and the development of the 3-way bulb.
Many people think that the diffuser IS a shade in itself and look for one that is fancy or colored. This is not the case.
A diffuser is simply a glass bowl that is made to diffuse the light
A fabric shade then sits on top for aesthetics and to soften the glare
from the bright bulbs.
Floor lamps with a 3 candelabra sockets around the diffuser are the
most common and popular type of lamps that take a diffuser. Diffuser lamps are still very popular today because of the great light they provide. They take large "Mogul" bulbs in
the center which are very high wattage and therefore,
are a powerful light source without being harsh.
Diffuser Shades /
Mogul Bulbs and Parts