Philips LP2PB201CS - Manual (Page 30)

The numbers x and y do not have units of measurements; while there are two main
units of measurement of factor Y in use today: ‘Candela per square meter” (Nit) and
‘Foot Lamberts’(FI).
If we consider your Brilliance 201CS monitor, it has three preset RGB white balan­
ce adjustments that, according to the CIE xyY system, can be defined as follows:
Preset 1 X = 0,283 y -= 0,298 Y > 28 Foot Lamberts
Preset 2 x - 0,313 y = 0,329 Y > 23 Foot Lamberts
Preset 3 X = 0,332 y = 0,347 Y > 23 Foot Lamberts
Color temperature
According to the Black body radiation theory in physics, an ideal object will glow with
a characteristic color when heated. The color can be calculated mathematically and
it can be shown that as the temperature increases this glow moves from infra red
through dull red, orange, yellow, yellow white and eventually to bluish white.
As the color produced at a given temperature can be precisely predicted, then it is
possible to define white light in terms of color temperature.
The white point color temperature is therefore a measure in Kelvin degrees of ‘how
white’ a white is.
Back to your Brilliance 201 CS, the Preset 1 adjustment corresponds to a color tem­
perature of 9300 Kelvin degrees and shows a bluish tint; Preset 2 is set to 6500
Kelvin degrees and has a reddish tint. Preset 3 is set to 5500 Kelvin degrees.
As an additional example, the color temperature of sunlight at noon, when the sun
is shining directly overhead, is approximately 5000 Kelvin degrees.
Appendix A 23