- 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.
The measure of luminous intensity of a source in a given direction. The term has been retained from the early days of lighting when a standard candle of a fixed size and composition was defined as producing one candela in every direction. A plot of intensity versus direction is called a candela distribution curve and is often provided for reflectorized lamps and for luminaires with a lamp operating in them.
Industry:Lights & lighting
An obsolete term for luminous intensity; current practice is to refer to this simply as candelas.
Industry:Lights & lighting
Initial mean spherical candlepower at the design voltage. Mean spherical candlepower is the generally accepted method of rating the total light output of miniature lamps. To convert this rating to lumens, multiply it by 12.57 (4 pi).
Industry:Lights & lighting
A graphical presentation of the distribution of light intensity of a light source, usually a reflector lamp or luminaire.
Industry:Lights & lighting
Device in ballast that stores electrical energy. Often used for power factor correction and lamp regulation.
Industry:Lights & lighting
Number of product units packed in a master case. Also known as Standard Package Quantity.
Industry:Lights & lighting
Metal filaments that emit electrons in a fluorescent lamp. Negatively charged free electrons emitted by the cathode are attracted to the positive electrode (anode), creating an electric current between the electrodes.
Industry:Lights & lighting
Resistance of the cathode in a Fluorescent lamp. It is measured "cold" before the lamp is turned on (Rc) or "hot" after the lamp is turned on (Rh). The ratio of the hot resistance to the cold resistance is also measured (Rh/Rc).
Industry:Lights & lighting
Refers to the luminous intensity at the center of the beam of a blown or pressed reflector lamp (such as a PAR lamp). Measured in candelas.
Industry:Lights & lighting
