Lighting Device
First Claim
1. A lighting device comprisinga lighting unit comprising light sources for generating red, green and blue light,ballast circuitry for supplying supply currents to the light sources in the lighting unit,a control circuit for controlling the operational state of the ballast circuitry by adjusting one or more operational parameters, anda user interface, coupled to the control circuit, for adjusting the color or the color and intensity of the light generated by the lighting unit, said user interface being provided with a sensing device for sensing a user action resulting in an output signal of the user interface, said output signal adjusting the operational parameters via the control circuit, said sensing device being provided with a number of adjustment points where a user action is possible, each of the adjustment points corresponding to a different color and/or intensity of the light generated by the lighting unit, characterized in that the lighting device is equipped with a memory for storing a color table, each adjustment point corresponding to an element of the color table and each element of the color table comprising data determining the values of the operational parameters of the ballast circuitry corresponding to the adjustment point, and in that the color difference calculated in the CIELAB color space between the color points of the generated light corresponding to adjacent adjustment points is the same for a fraction of the adjustment points.
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Accused Products
Abstract
In a lighting device equipped with three light sources supplying red, green and blue light respectively, the color and/or intensity of the light generated by the three light sources together can be adjusted by means of adjustment points. The colors corresponding to the adjustment points are chosen so that for a fraction of the adjustment points the color difference calculated in the CIELAB space between the colors corresponding to adjacent adjustment points is the same. An inexperienced user can easily find a desired color setting since the change in color perceived by the user is the same for all the adjustment points belonging to said fraction.
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Citations
21 Claims
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1. A lighting device comprising
a lighting unit comprising light sources for generating red, green and blue light, ballast circuitry for supplying supply currents to the light sources in the lighting unit, a control circuit for controlling the operational state of the ballast circuitry by adjusting one or more operational parameters, and a user interface, coupled to the control circuit, for adjusting the color or the color and intensity of the light generated by the lighting unit, said user interface being provided with a sensing device for sensing a user action resulting in an output signal of the user interface, said output signal adjusting the operational parameters via the control circuit, said sensing device being provided with a number of adjustment points where a user action is possible, each of the adjustment points corresponding to a different color and/or intensity of the light generated by the lighting unit, characterized in that the lighting device is equipped with a memory for storing a color table, each adjustment point corresponding to an element of the color table and each element of the color table comprising data determining the values of the operational parameters of the ballast circuitry corresponding to the adjustment point, and in that the color difference calculated in the CIELAB color space between the color points of the generated light corresponding to adjacent adjustment points is the same for a fraction of the adjustment points.
Specification