400w 120v R40 Med Base
Glass & Metal
The lamp is composed of a standard heat-resistant glass envelope surrounding a tungsten filament. Depending on lamp type and color traces of additional elements may be added to the glass to adjust its properties. The quantities of elements added are minimal and deemed to be non-hazardous. The envelope may also be coated with a diffusing material.
Diffusing Material
Coating on the interior of the lamp is typically specially prepared Kaolin clay, or in certain instances a combination of Kaolin clay and a pigment to create colored lamps. If the diffusing material is coated on the exterior of the lamp it consists of a fired glass material containing the suitable pigments.
Metals
As stated above, the lamp filament is composed of tungsten. In addition to this tungsten, there may also be molybdenum, copper, iron and/or nickel depending on the lamp construction used as support wires or for electrical connections. Lamp bases may include brass, nickel and/or aluminum. Lead solder may also be used.
