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Specifi cations, compliances and dimensions subject to change without notice
EATON Halo Product Catalog Recessed Downlighting
17
Color Temp WARM WHITE NEUTRAL COOL DAYLIGHT
Kelvin Range 2700K 3000K 3500K 4100K 5000K
Effects
Warm
Cozy
Open
Friendly
Intimate
Personal
Friendly
Safe
Neutral
Neat
Clean
Efficient
Bright
Alert
Crisp
Typical
Applications
Homes
Restaurants
Hotels
Boutiques
Homes
Libraries
Office Areas
Retail Stores
Office Areas
Public Areas
Showrooms
Bookstores
Hospitals
Office Areas
Conference Rooms
Classrooms
Printing Companies
Museum Displays
Jewelry Displays
Medical Exam Areas
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 solid state LED and 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.
9000 DAYLIGHT
8500
Northlight/Blue Sky
8000
7500
7000
6500
Daylight Fluorescent Lamp
6000
5500
5000
4500
Clear Metal Halide Lamp
4000
Cool White 4100K Fluorescent Lamp
3500
Fluorescent Lamp 3500K
3000
Warm White 3000K Fluorescent Lamp
2500
2000
High Pressure Sodium Lamp
1500 WARMER
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.
A halogen 72W A19 clear lamp has 1520
nominal lamp lumens. The luminous flux is
provided by the lamp manufacturers in a
listing of common lamp and lumen values.
Units: Lumens (lm)
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.
Units: Candela (cd)
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.
Units: Footcandles (fc)
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.
Units: Candelas per Square Meter (cd/m2)
Luminous Flux (Lumens)
Luminous Intensity (Candela)
Illuminance (Footcandles)
Luminance (Candelas/Meter
2
)
Correlated Color Temperature (CCT)
Lighting Properties
Halo Recessed Lighting
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Cx
Cy
Color Rendering Index (CRI)
The color rendering index (CRI) of a light source describes the influence of light on the
color appearance of objects being illuminated. CRI describes the apparent color shift
undergone by a standard set of test colors illuminated by a source as compared to
their appearance under the blackbody reference source. The apparent shift in colors is
measured and averaged on the CRI chromaticity diagram, and the higher the number,
the closer the apparent match. Since CRI is an average it is not possible to predict the
effect on one particular color, and consequently, different lamps with the same CRI
may not render colors alike. CRI is only a valid comparison when comparing lamps
of the same color temperature since the appearance of the test colors vary as the
reference blackbody radiator varies.
Units: CRI (on a scale up to 100)
Color Temperature & Effects of Lighting
A 19
Halogen - LED - CFL
0º
30º
60º
90º
E
E
Horizontal
Vertical