Lars on Diigo's Profile

Technical
Terms

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.