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US 2021/0278061 A1Published application
Lighting systems for general illumination and disinfection
AssigneeJuganu Ltd.
InventorsEran Ben-Shmuel, Ada Lotan, Alexander Bilchinsky, Eran Efrati, Jonathan Stok, Yossi Bechor, Yoav Bar, Noam Meir
Life of this patent
Estimating the term…
Abstract
Lighting systems combine UV-A and white light with an adjustable CCT value so that any adverse effects from the UV-A radiation are mitigated—that is, tunable adjustments to the output of the non-UV LEDs, or to all of the LEDs, result in an overall mixed output conforming to a target CCT value.
Claims24
A lighting device producing white light having a target color correlated temperature (CCT) value and UV-A radiation, the device comprising:
- a first plurality of LEDs emitting light at a first wavelength corresponding to red light, a second plurality of LEDs emitting light at a second wavelength different from the first wavelength, and a plurality of UV-A LEDs emitting UV radiation having a wavelength in a range from approximately 315 nm to approximately 420 nm;
- at least one photo-luminescent material for shifting a CCT value of at least the second plurality of LEDs to produce white light;
- a waveguide material having (i) a mixing region for mixing the shifted and any unshifted light so as to generate white light having the target CCT value and (ii) an output region for outputting the white light;
- a plurality of UV-C LEDs emitting UV radiation having a wavelength in a range from approximately 100 nm to approximately 280 nm;
- and
- a controller configured to turn off all UV-C LEDs following a time interval sufficient to achieve a target pathogen deactivation level in the activation region, and activate the red LEDs to produce red illumination for signaling completion of the UV-C mode.
3 more elements
-40. (canceled)
A lighting device comprising:
- a first plurality of LEDs emitting light at a first wavelength corresponding to red light, a second plurality of LEDs emitting light at a second wavelength different from the first wavelength, a plurality of UV-A LEDs emitting UV radiation having a wavelength between approximately 315 nm and approximately 420 nm, and a plurality of UV-C LEDs emitting UV radiation having a wavelength between approximately 100 nm and approximately 280 nm;
- at least one photoluminescent material for shifting a CCT value of at least the second plurality of LEDs to produce white light;
- a waveguide material having (i) a mixing region for mixing the shifted and any unshifted light so as to generate white light having the target CCT value and (ii) an output region for outputting the white light;
- at least one occupancy sensor;
- and
- a controller responsive to the at least one occupancy sensor and configured to operate the plurality of devices in (a) a normal mode, powering the LEDs so as to generate white light having the target CCT value while emitting UV-A light or (b) in a UV-C mode comprising powering at least some of the UV-C LEDs to illuminate an activation region only if no personnel are sensed by the occupancy sensor for a time interval sufficient to achieve a target pathogen deactivation level in the activation region.
3 more elements
-63. (canceled)
Dependencies are inferred from the claim text.