COLOUR LIGHT OUTPUT
- an easy way to evaluate projector colour output
What is Colour Light Output?
Colour Light Output (CLO) is a specifi cation that provides critical information
on a projector’s ability to deliver colour. Developed by colour scientists
using the same approach as White Light Output (Brightness) measurement,
Colour Light Output provides the buyer with additional key information about
colour.
Does Brightness measure colour?
No. Current product specifi cations such as Brightness (or White Light
Output), Contrast Ratio and Resolution give no information regarding a
projector’s ability to reproduce colour. The existing Brightness specifi cation
only measures the total amount of White Light projected. It does not
measure colour – in fact, many manufacturers artifi cially boost brightness by
adding white light, which dilutes the projector’s colour brightness.
Why is Colour Light Output important?
Colour Light Output is critically important because it measures the
brightness of Red, Green and Blue. Red, Green and Blue create white when
combined in the right proportions. They also comprise the input signal that
tells your projector how to reproduce colour images. Beautifully balanced
colour is possible when bright Red, Green and Blue combine to produce
the brightness equal to White. Colour Light Output provides users with an
additional way to evaluate a projector and make more discerning buying
decisions.
Is Colour Light Output the same in all projectors?
No. There are vast differences in the Colour Light Output of projectors on
the market today. Look at the images below from two competing projectors
How is Colour Light Output measured?
Image #2*Image #2*
Brightness (or White Light Output)
measures the total amount of white
light projected in lumens on a nine
point grid. It does not measure colour.
Colour Light Output uses 3 sets of a
nine-point grid to measure the primary
colours - red, green and blue, using
the same approach used to measure
White Light Output in lumens.
How should Colour Light Output be used?
Colour Light Output should be used with White Light Output to provide
insight into a projector’s overall picture quality. Two things to remember:
3LCD Projector Brand X
Image #1*Image #1*
When selecting a projector, ask for
the Colour Light Output measurement.
1. Select High Colour Light Output.
2. Make sure the Colour Light Output
equals the White Light Output.
Colour Light Output specifi cation
describes the difference in colour between
these two projectors.
Brand X
Low CLO
White Light Output
Colour Light Output
800 Lumens
=
/
2200 Lumens
=
2200 Lumens
2200 Lumens
White Light Output
Colour Light Output
3LCD
Projector
High CLO
* Actual photographs of images produced by 2 competing projectors run in
default mode. Price, Resolution and Brightness (White Light Output) are the
same for both projectors.
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x
x
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x
x
x
x
x
x
x
x
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x
x
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Red
RedGreen
GreenBlue
Blue
Red
Blue
Green
www.colorlightoutput.com
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