Lighting system and a method of generating a light output
AssigneeSignify Holding B.V.
InventorsHendrikus Hubertus Petrus Gommans, Jochen Renaat Van Gheluwe
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Abstract
A lighting module has an LED (44), a lens (45) over the LED to produce a beam-shaped output from the LED and a collimator (50) arranged to partially collimate the beam-shaped out-put. Blue light is provided at large angles to the normal, for example using a filter arrangement (54, 56) over the collimator which is adapted to filter light from the collimator at relatively large angles to the normal. The filter arrangement does not filter light from the collimator at relatively small angles to the normal. Thus, the module provides white task light in a normal direction and blue ambient light at steep angles. The overall system can be compact and light efficient.
Claims11
A lighting module comprising:
- an LED (44);
- a lens over the LED to produce a beam-shaped output from the LED;
- a collimator arranged to partially collimate the beam-shaped output, said collimator comprising a total internal reflection Fresnel lens;
- and
- a blue light generator for providing blue light at relatively large angles to the normal, the relatively large angles being angles greater than 40 degrees away from the normal,
- wherein the collimator provides an output which comprises a narrow collimated relatively high intensity beam and a wide relatively low intensity beam;
- and
- wherein the blue light generator further comprises a filter arrangement over the collimator, the filter arrangement being adapted to filter light from the collimator at the relatively large angles to the normal to provide blue light;
- and
- wherein the filter arrangement does not filter light from the collimator at relatively small angles to the normal, the relatively small angles being less than 40 degrees away from the normal.
A method of generating a light output, comprising:
- providing a light output from an LED (44);
- beam shaping the light output using a lens to create a beam-shaped output;
- partially collimating the beam-shaped output using a total internal reflection Fresnel lens;
- providing blue light at relatively large angles to the normal, the relatively large angles being angles greater than 40 degrees away from the normal;
- and
- filtering the light output from the collimator at the relatively large angles to the normal to provide blue light;
- and
- passing the light output from the collimator at relatively small angles to the normal unfiltered through the filter, the relatively small angles being less than 40 degrees away from the normal.
Dependencies are inferred from the claim text.