US 2014/0228914 A1Published application

Solid state light emitting devices including adjustable melatonin suppression effects

AssigneeCree, Inc.

InventorsAntony Paul van de Ven, Paul Kenneth Pickard

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Abstract

Solid state light emitting devices include multiple LED components providing adjustable melatonin suppression effects. Multiple LED components may be operated simultaneously according to different operating modes according to which their combined output provides the same or similar chromaticity, but provides melatonin suppressing effects that differ by at least a predetermined threshold amount between the different operating modes. Switching between operating modes may be triggered by user input elements, timers/clocks, or sensors (e.g., photosensors). Chromaticity of combined output of multiple LED components may also be adjusted, together with providing adjustable melatonin suppression effects at each selected combined output chromaticity.

Claims49

Dependent claims

A light emitting apparatus comprising:

a first LED component;
and
a second LED component;
wherein the first LED component and the second LED component are arranged to be operated in a first operating mode in which combined emissions of the first LED component and the second LED component (i) are within four MacAdam ellipses of a target correlated color temperature, and (ii) embody a first melatonin suppression milliwatt per hundred lumens value;
wherein the first LED component and the second LED component are arranged to be operated in a second operating mode in which combined emissions of the first LED component and the second LED component (i) are within four MacAdam ellipses of the target correlated color temperature, and (ii) embody a second melatonin suppression per hundred lumens value that is at least about 10 percent greater than the first melatonin suppression per hundred lumens value;
and
wherein the light emitting apparatus comprises at least one of the following features (a) and (b):
(a) at least one of the first LED component and the second LED component comprises at least one LED arranged to stimulate emissions of at least one lumiphoric material;
and
(b) combined emissions of the first LED component and the second LED component when operated in the first operating mode embody a color rendering index (CRI) value of at least about 80.

7 more elements

A light emitting apparatus comprising:

a first LED component;
and
a second LED component;
wherein the first LED component and the second LED component are arranged to be operated at or near a first target correlated color temperature in a first operating mode in which combined emissions of the first LED component and the second LED component (i) are within four MacAdam ellipses of the first target correlated color temperature, and (ii) embody a first melatonin suppression milliwatt per hundred lumens value;
wherein the first LED component and the second LED component are arranged to be operated at or near the first target correlated color temperature in a second operating mode in which combined emissions of the first LED component and the second LED component (i) are within four MacAdam ellipses of the first target correlated color temperature, and (ii) embody a second melatonin suppression per hundred lumens value that is at least about 10 percent greater than the first melatonin suppression per hundred lumens value;
wherein the first LED component and the second LED component are arranged to be operated at or near a second target correlated color temperature in a third operating mode in which combined emissions of the first LED component and the second LED component (i) are within four MacAdam ellipses of the second target correlated color temperature, and (ii) embody a third melatonin suppression milliwatt per hundred lumens value;
wherein the first LED component and the second LED component are arranged to be operated at or near the second target correlated color temperature in a fourth operating mode in which combined emissions of the first LED component and the second LED component (i) are within four MacAdam ellipses of the second target correlated color temperature, and (ii) embody a fourth melatonin suppression per hundred lumens value that is at least about 10 percent greater than the third melatonin suppression per hundred lumens value;
and
wherein the second target correlated color temperature differs from the first correlated color temperature by at least about 300K.

6 more elements

Dependencies are inferred from the claim text.