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Color Rendering
Index (CRI) A key performance characteristic,
color rendering, is the ability of the light source to represent
colors in objects. The relative measure of this ability is color
rendering index or CRI which rates the light sources on a scale of 0
to 100. The higher the CRI, the more vibrant or close to natural
the colors of objects appear. Natural daylight has been assigned a
CRI of 100 at a Kelvin temperature of between 5000-7500K. The Accu-Tech
performs at 90 CRI which produces excellent color rendition when
color matching is critical.
Correlated
Color Temperature(Kelvin), Color temperature or
chromaticity refers to the color appearance of the light that comes
from a light source. Also referred to as Correlated Color
Temperature (CTT), the apparent color of light source is measured in
Kelvin or "K".
Imagining a piece of iron (a horseshoe, for instance) in a fire
can help you visualize color temperature in lamp types designated as
"warm" or "cool". At first the iron becomes "red-hot". Red is the
color of light be generated by the metal at a certain temperature.
Continuing to heat the metal makes it "white-hot", and heating it
further would cause it to become "blue-hot" (like flash bulbs or
stars).
In describing color temperatures a low color temperature
corresponds to a "warm" or a red yellow appearance like incandescent
lamps at 2700 Kelvin. "Cool" light comes from light sources like
cool white fluorescent lamps operating at 4100 Kelvin. The higher
the Kelvin temperature, the whiter and then the bluer the light. In
the case of the Accu-Tech at 5900 Kelvin this produces a color on
the blue spectrum very close to natural daylight.
Lumen is the unit
that expresses the total quantity of light given off by a source,
regardless of direction. A lumen is defined as the amount of light
falling on a surface of one square foot, every point which is one
foot away from a source of one candlepower. A uniform source of one
candlepower placed in a sphere emits 12.57 lumens.
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