# US 11,910,500 B2 · Lighting apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,500 B2 - Document ID: US11910500B2 - Status: Granted - Kind: B2 - Application number: 17/862,361 - Filed: 2022-07-11 - Published: 2023-01-12 - Granted: 2024-02-20 - Earliest claimed: 2021-07-09 - Assignees: Leedarson Lighting Co., Ltd. - Applicants: Leedarson Lighting Co., Ltd. - Inventors: Jiayuan Zhang; Changjing Zeng; Jingjing Su; Xiaoming Yang; Zongyuan Liu; Liangliang Cao - Web page: https://patentgrep.com/patent/US11910500B2 ## CPC - H05B 45/20: Controlling the colour of the light - H05B 45/46: having LEDs disposed in parallel lines - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A lighting apparatus includes a first light source, a second light source and a driver. The first light source has multiple first LED modules. The second light source has multiple second LED modules. The driver controls the first light source and the second light source to generate an output light of a required mixed color temperature. The driver selects a first subset of the multiple first LED modules and a second subset of the multiple second LED modules to generate a first output light with a first color temperature. The driver selects a third subset of the multiple first LED modules and a fourth subset of the multiple second LED modules to generate a second output light with a second color temperature. The first subset is not equal to the third subset. The second subset is not equal to the fourth subset. ## Claims ### Claim 1 A lighting apparatus, comprising: a first light source having multiple first LED modules; a second light source having multiple second LED modules; and a driver for control the first light source and the second light source to generate an output light of a required mixed color temperature, wherein the driver selects a first subset of the multiple first LED modules and a second subset of the multiple second LED modules to generate a first output light with a first color temperature, wherein the driver selects a third subset of the multiple first LED modules and a fourth subset of the multiple second LED modules to generate a second output light with a second color temperature, wherein the first subset is not equal to the third subset, wherein the second subset is not equal to the fourth subset. ### Claim 2 (depends on 1) The lighting apparatus of claim 1, wherein a portion of the multiple first LED modules and a portion of multiple second LED modules are not turned on for generating a third output light with a third color temperature. ### Claim 3 (depends on 2) The lighting apparatus of claim 2, wherein the driver determines a first activation number of the first LED modules and a second activation number of the second LED modules to mix a target color temperature. ### Claim 4 (depends on 3) The lighting apparatus of claim 3, wherein the first activation number and the second activation number are determined according a mixing formula approaching to a blackbody chromaticity diagram. ### Claim 5 (depends on 4) The lighting apparatus of claim 4, wherein a color tolerance adjustment of a mixed color temperature is less than 7 steps. ### Claim 6 (depends on 5) The lighting apparatus of claim 5, wherein the color tolerance adjustment of a mixed color temperature is less than 5 steps. ### Claim 7 (depends on 1) The lighting apparatus of claim 1, wherein the first LED module comprises multiple first LED chips connected in series as multiple first LED strings, wherein the second LED module comprises multiple second LED chips connected in series as multiple second LED strings. ### Claim 8 (depends on 7) The lighting apparatus of claim 7, wherein the first subset of the multiple first LED modules corresponds to a number of first LED strings, wherein the second subset of the multiple second LED modules corresponds to a number of second LED strings. ### Claim 9 (depends on 7) The lighting apparatus of claim 7, wherein the first LED series and the second LED series include same number of LED chips. ### Claim 10 (depends on 1) The lighting apparatus of claim 1, wherein the driver comprises a manual switch for a user to select from multiple options, wherein a first option corresponds to the first subset and the second subset, wherein a second option corresponds to the third subset and the fourth subset. ### Claim 11 (depends on 10) The lighting apparatus of claim 10, wherein manual switch is a mechanical switch for the user to operate. ### Claim 12 (depends on 11) The lighting apparatus of claim 11, wherein when the first option is selected, the first subset of multiple first LED modules are activated and other first LED modules of the first light source is not activated. ### Claim 13 (depends on 1) The lighting apparatus of claim 1, further comprising a third light source comprising multiple third LED modules, wherein the driver selects a variation number of the multiple third LED modules together with the first light source and the second light source to generate a target color temperature. ### Claim 14 (depends on 1) The lighting apparatus of claim 1, wherein the first light source has a color temperature between 2700K to 7000K, wherein the second light source has a color temperature between 1800K to 5500K, wherein a target color temperature mixed by the first light source and the second light source is between 2580K to 6020K. ### Claim 15 (depends on 14) The lighting apparatus of claim 14, wherein a first input voltage is supplied to the multiple first LED modules, wherein a second input voltage is supplied to the multiple second LED modules, wherein a difference between the first input voltage and the second input voltage is less than 10%. ### Claim 16 (depends on 1) The lighting apparatus of claim 1, wherein the multiple first LED modules and the multiple second LED modules are arranged on a circuit board in an alternative order. ### Claim 17 (depends on 16) The lighting apparatus of claim 16, wherein the first light source and the second light source are integrated on a single circuit board to form a light module. ### Claim 18 (depends on 17) The lighting apparatus of claim 17, wherein the first light source and the second light source are arranged with other light sources in a symmetric manner. ### Claim 19 (depends on 1) The lighting apparatus of claim 1, wherein the first light source, the second light source and the driver are integrated on a single circuit board. ### Claim 20 (depends on 19) The lighting apparatus of claim 19, wherein a manual switch is mounted on the single circuit board for a user to select a target color temperature.