Card Set Information
Color Rendering and Unit of Measure
The term that is used to describe the appearance effect that light sources have on materials is color rendering.
It is measured on a scale of 0-100 which is the color rendering index.
Unit that measures the accumulation (density) of light energy on a surface. (footcandle or lux)
Unit of luminance = 1 candela per sq. ft
Also called luminance.
Reflectivity of light on a surface.
Spectral Power Distribution Curve
Graphs spectral characteristics of a light source, showing the radiant power of the light source at each wavelength or band of wavelengths across the visible spectrum.
Low Voltage Lamps and Operating Components
Incandescent lamps, the lower the voltage, the less bright the light, the lamp lasts longer
Primary component to operate a low voltage lamp
: a transformer
Electric Discharge Lamps and Operating Components
High Intensity Discharge lamps, chemicals explode and ignite to create an arc stream.
Flourescent, mercury turns into gas and becomes ultraviolet radiation. Phosphorus coating starts glowing.
Primary component to operate elec. dis. lamps
: a ballast (regulates current and provides initial starting voltage)
Advantage of Halogen Lamp Process
Long lamp life
Pressure and Heat, really HOT
1. Tungsten boils off filament
2. Bromine picks up Tungsten
3. Returns tungsten to filament
Take it to 100%, then you can cool it down.
For lamps that throw light everywhere
Very bright, high efficiency, strictly decorative trim
With a built in reflector.