- 行业: Energy
- Number of terms: 8202
- Number of blossaries: 3
- Company Profile:
American conglomerate currently ranked by Forbes as the world's largest company. GE has multifarious business interests including power generation and financial services.
Time it takes for a High Intensity Discharge lamp to reach 90% of light output after going from on to off to on.
Industry:Lights & lighting
An electronic device providing a high voltage pulse to initiate an electrical discharge. Typically, the ignitor is paired with or is a part of the ballast (See STARTER).
Industry:Lights & lighting
The "density" of light (lumens/area) incident on a surface; i.e. the light level on a surface. Illuminance is measured in footcandles or lux.
Industry:Lights & lighting
A device that measures the illuminance at a location calibrated either in footcandles or in lux. (Also know as a light metre -- See COSINE CORRECTED)
Industry:Lights & lighting
A light source that generates light utilising a thin filament wire (usually of tungsten) heated to white heat by an electric current passing through it.
Industry:Lights & lighting
The method of lighting a space by directing the light from luminaires upwards towards the ceiling. The light scattered off the ceiling produces a soft, diffuse illumination for the entire area.
Industry:Lights & lighting
Gases can be excited directly by radio-frequency or microwaves from a coil that creates induced electromagnetic fields. This is called induction lighting and it differs from a conventional discharge, which uses electrodes to carry current into the arc. Induction lamps have no electrodes inside the chamber and generally, therefore, have longer life than standard lamps. Genura® is an example of an induction lamp.
Industry:Lights & lighting
Electromagnetic energy radiated in the wavelength range of about 770 to 1,000,000 nanometers. Energy in this range cannot be seen by the human eye, but can be sensed as heat by the skin.
Industry:Lights & lighting
Power supply voltage required for proper operation of fluorescent or HID ballast.
Industry:Lights & lighting
The total power input to the ballast which includes lamp watts and ballast losses. The total power input to the fixture is the input watts to the ballast or ballasts and is the value to be used when calculating cost of energy and air conditioning loads.
Industry:Lights & lighting
