Luminaries constructed so that a specified vapor and gas cannot enter its enclosure - normally water vapor.
Voltage:
The difference in electrical charge between two points in a circuit that expressed in volts; the electric pressure that exists between both points and is capable of producing a flow of current when it is closed circuit a connected between the two points; the rate at which energy is drawn from a source that produces a flow of electricity in a circuit.
Valance Lighting:
A system comprising light sources shielded by the panel parallel to the wall at the top of a window; both down and up light.
Vases:
An open container, as of glass and porcelain, used for holding flowers or for ornamentation.
