- 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.
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
A measure of "electrical pressure" between two points. The higher the voltage, the more current will be pushed through a resistor connected across the points. The volt specification of an incandescent lamp is the electrical "pressure" required to drive it at its designed point. The "voltage" of a ballast (e.g. 277 V) refers to the line voltage it must be connected to.
Industry:Lights & lighting
A unit of electrical power. Lamps are rated in watts to indicate the rate at which they consume energy. (See KILOWATT HOUR).
Industry:Lights & lighting
The distance between two neighboring crests of a traveling wave. The wavelength of light is between 400 and 700 nanometers.
Industry:Lights & lighting
("Amps.") A measure of electrical current. In incandescent lamps, the current is related to voltage and power as follows: Watts (power) = Volts x Amps (current).
Industry:Lights & lighting
Whether the operational voltage is based on Alternating Current or Direct Current.
Industry:Lights & lighting
A lamp resembling the color of daylight, typically with a color temperature of 5500 K to 6500K
Industry:Lights & lighting
A measurement of how effective the light source is in converting electrical energy to lumens of visible light. Expressed in lumens-per-watt (LPW) this measure gives more weight to the yellow region of the spectrum and less weight to the blue and red region where the eye is not as sensitive.
Industry:Lights & lighting
The efficiency of a light source is simply the fraction of electrical energy converted to light, i.e. watts of visible light produced for each watt of electrical power with no concern about the wavelength where the energy is being radiated. For example, a 100 watt incandescent lamp converts 7% of the electrical energy into light; discharge lamps convert 25% to 40% into light. The efficiency of a luminaire or fixture is the percentage of the lamp lumens that actually comes out of the fixture (See LUMINOUS EFFICACY).
Industry:Lights & lighting
