| Glossary |
Amperes (Amps)
A measure of electrical current.
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Center Beam Candle power (CBCP)
The luminous intensity at the center of the beam of a reflector lamp.
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Color Rendering Index (CRI)
A lamp's ability to render an object's true colors based on a scale of 100.
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Color Temperature
A numerical measurement of the color appearance of a light source measured in degrees Kelvin (K). It also refers to the way color groups are perceived (psychological impact of lighting) with "warm" colors at the red / orange / yellow end of the spectrum and "cool" at the blue end.
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Footcandle (fc)
A unit of illuminance or light falling onto a surface measured as the light level on a surface one foot from a standard candle.
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Lumen (lm)
A measure of luminous flux or quantity of light emitted by a source.
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Lux (lx)
A unit of illuminance or light falling onto a surface. One lux is equal to one lumen per square meter.
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Luminous Efficacy
The light output (lumens) of a light source divided by the total power input (watts) to that source. It is expressed in lumens per watt.
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Maximum Overall Length (M.O.L.)
The end-to-end measurement of a lamp, expressed in inches or millimeters.
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Phosphor
An inorganic chemical compound processed into a powder and deposited on the inner glass surface of fluorescent tubes, CFL's and some mercury and metal-halide lamp bulbs.
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Rated Lamp Life
The length of time of a statistically large sample between first use and the point when 50% of lamps died.
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Voltage
A measurement of the electromotive force in an electrical circuit or device expressed in volts.
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Watt
A unit of electrical power. Lamps are rated in watts to indicate the rate at which they consume energy.
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