# US 9,437,786 B2 · Light emitting device for illuminating plants > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,437,786 B2 - Document ID: US9437786B2 - Status: Granted - Kind: B2 - Application number: 14/936,025 - Filed: 2015-11-09 - Published: 2016-03-03 - Granted: 2016-09-06 - Earliest claimed: 2013-06-21 - Assignees: Venntis Technologies LLC - Applicants: Venntis Technologies LLC - Inventors: Jeffrey L. Mastin; Daniel J. Fisher; Jamie C. Caldwell; David W. Caldwell; William D. Schaefer; Justin T. Teitt - Web page: https://patentgrep.com/patent/US9437786B2 ## CPC - H10H 20/851: Wavelength conversion means - H10H 20/813: having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies - H10H 20/8515: {not being in contact with the bodies} - H10H 20/853: characterised by their shape - H10H 20/855: Optical field-shaping means, e.g. lenses - H10H 20/856: Reflecting means - H10H 20/8582: {characterised by their shape} - H10H 29/10: Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00 (active-matrix LED displays H10H29/30) - A01G 7/045: {with electric lighting} - H10H 20/882: {Scattering means (H10H20/82 takes precedence)} - Y02P 60/14: Measures for saving energy, e.g. in green houses - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12) - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A spectrally adapted light emitting device for illuminating plants includes at least one semiconductor light-emitting diode (LED), at least one light conversion element for down-converting a portion of light emitted at the first wavelength to at least a second wavelength between 600 nm-680 nm, and at least one scattering device to diffuse light within the light emitting device. The at least one LED is configured to emit at least a first wavelength between 400 nm and 480 nm. The spectral light output from the spectrally adapted light emitting device is bi-modal with wavelengths in a range of 400 nm and 800 nm including a first local maximum between 400 nm and 480 nm and a second local maximum between 600 nm-680 nm with a local minimum between the first local maximum and the second local maximum. ## Claims ### Claim 1 A spectrally adapted light emitting device for illuminating plants, the device comprising: at least one semiconductor light-emitting diode (LED) wherein the at least one LED is configured to emit at least a first wavelength between 400 nm (nanometers) and 480 nm; at least one light conversion element for down converting a portion of light emitted at the first wavelength to at least a second wavelength between 600 nm-680 nm; and at least one scattering device to diffuse light within the light emitting device; wherein a spectral light output from the spectrally adapted light emitting device is bi-modal with wavelengths in a range of 400 nm and 800 nm including a first local maximum between 400 nm-480 nm, a second local maximum between 600 nm-680 nm with a local minimum between the first local maximum and the second local maximum. ### Claim 2 (depends on 1) The spectrally adapted light emitting device of claim 1 wherein a photon flux of the second local maximum is larger than a photon flux of the first local maximum. ### Claim 3 (depends on 2) The spectrally adapted light emitting device of claim 2 wherein the integral of the photon flux between the local minimum and 800 nm is 3-9 times greater than the integral of the photon flux between 400 nm and the local minimum. ### Claim 4 (depends on 1) The spectrally adapted light emitting device of claim 1 wherein a Full Width Half Maximum (FWHM) at the second local maximum is between 60 nm-120 nm. ### Claim 5 (depends on 1) The spectrally adapted light emitting device of claim 1 wherein the at least one light conversion element comprises a phosphor. ### Claim 6 (depends on 5) The spectrally adapted light emitting device of claim 5 wherein the phosphor comprises phosphor particles dispersed in a resin. ### Claim 7 (depends on 5) The spectrally adapted light emitting device of claim 5 wherein the phosphor is remote from the at least one LED. ### Claim 8 (depends on 1) The spectrally adapted light emitting device of claim 1 further comprising at least one reflector. ### Claim 9 (depends on 8) The spectrally adapted light emitting device of claim 8 wherein the at least one reflector provides a boundary for the light conversion element distal from the at least one LED. ### Claim 10 (depends on 8) The spectrally adapted light emitting device of claim 8 wherein the at least one reflector is a diffuse reflector so as to be the at least one scattering device. ### Claim 11 (depends on 8) The spectrally adapted light emitting device of claim 8 wherein the at least one reflector is a specular reflector wherein the specular reflector is configured to direct light out of the at least one light conversion element. ### Claim 12 (depends on 8) The spectrally adapted light emitting device of claim 8 wherein the at least one reflector is a reflector external to the light conversion element wherein the reflector is configured to direct at least a portion of the light output from the light conversion element in a generally uniform light distribution pattern. ### Claim 13 (depends on 1) The spectrally adapted light emitting device of claim 1 comprising a plurality of LEDs in a single fixture. ### Claim 14 (depends on 1) The spectrally adapted light emitting device of claim 1 further comprising a heat sink. ### Claim 15 (depends on 1) The spectrally adapted light emitting device of claim 1 wherein the at least one scattering device comprises at least one of a diffuse reflector or a scattering material. ### Claim 16 (depends on 1) The spectrally adapted light emitting device of claim 1 wherein the spectral light output from the spectrally adapted light emitting device is omni-directional. ### Claim 17 (depends on 1) The spectrally adapted light emitting device of claim 1 wherein the at least one LED is a chip-on-board LED. ### Claim 18 (depends on 1) The spectrally adapted light emitting device of claim 1 further including a volume of encapsulant between the at least one LED and the at least one light conversion element. ### Claim 19 (depends on 18) The spectrally adapted light emitting device of claim 18 wherein at least a portion of the volume of the encapsulant is one of a dome, a hemisphere, a cone, a cylinder, a frustoconical shape, or any combination thereof. ### Claim 20 (depends on 9) The spectrally adapted light emitting device of claim 9 wherein the at least one reflector includes one of a dome, a hemisphere, a cone, a cylinder, a frustoconical shape, or any combination thereof extending axially towards the at least one LED.