Halo Recessed Lighting - Lighting properties

Nov. 28, 2011 - PRLog -- LUMINOUS FLUX (LUMENS)

Luminous flux (lumens) is the measure of the total light producing
power of the light source. It is the amount of light leaving the source
without regards to direction. An incandescent
100 watt inside frosted lamp has 1720
lamp lumens. A compact fluorescent 26
watt triple lamp has 1800 lamp lumens.
The luminous flux is provided by the lamp
manufacturers in a listing of common lamp
and lumen values.

LUMINOUS INTENSITY (CANDELA)

The luminous intensity (candelas) is the strength of the light produced in a specific direction. The luminous intensity of an optical system is compiled graphically into diagrams known as candela or candlepower distribution curves. Both polar and cartesian graphs are used within the lighting industry for this purpose. This information is also available in numeric tabular form.

ILLUMINANCE (FOOTCANDLES)

Illuminance is the measure of the quantity of luminous flux that arrives on a surface. Illuminance is affected by the luminous intensity from the fixture in the direction of the lighted surface, the distance from the luminaire to the surface, and the angle of incidence of the arriving light. Although illuminance cannot be detected by the eye, it is the most often used criteria in specifying lighting designs.

LUMINANCE (CANDELAS/METER2)
Luminance is the measure of light leaving a surface in a given direction. It is what the eye perceives. Typically, luminance reveals more about the quality and comfort of a lighting system than just illuminance alone.

COLOR TEMPERATURE
The color temperature (chromaticity) of a light source describes the actual color appearance of the light produced with regard to its warmth or coolness. Measured on the temperature scale of Kelvin, it is defined with the use of a reference light source termed a blackbody radiator. This reference is completely black when cold, and as it is heated begins to glow, taking on a reddish orange appearance. Heated further,
its color appearance shifts towards yellow, then white and eventually bluish white at the high end of the scale. An orange red color light has a lower color temperature than a blue white light. Psychologically, the lower Kelvin temperatures are perceived as “warm”, the higher as “cool”, the opposite of what might be expected. With discharge sources such as compact fluorescent and HID light is produced by methods other than heating a filament and the color is measured by its correlated color temperature (CCT). It is the measure of the color of the light, not the actual operating temperature of the lamp.

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