US 12,072,069 B2
Method for using white light source, and white light source
Masahiko Yamakawa, Kanagawa (JP); Kumpei Kobayashi, Kanagawa (JP); Ryoji Tsuda, Kanagawa (JP); Noriaki Yagi, Kanagawa (JP); Kiyoshi Inoue, Kanagawa (JP); and Kyung Hee Ye, Gyeonggi-do (KR)
Assigned to Seoul Semiconductor Co., Ltd., Gyeonggi-do (KR)
Filed by Seoul Semiconductor Co., Ltd., Gyeonggi-do (KR)
Filed on Sep. 4, 2023, as Appl. No. 18/241,927.
Application 18/241,927 is a continuation of application No. PCT/KR2022/003115, filed on Mar. 4, 2022.
Claims priority of application No. 2021-034434 (JP), filed on Mar. 4, 2021.
Prior Publication US 2024/0044459 A1, Feb. 8, 2024
Int. Cl. F21K 9/90 (2016.01); F21K 9/64 (2016.01); F21Y 115/10 (2016.01)
CPC F21K 9/90 (2013.01) [F21K 9/64 (2016.08); F21Y 2115/10 (2016.08)] 26 Claims
OG exemplary drawing
 
1. A white light source that emits light with a correlated color temperature in a range of 2500K or more to 10000K or less, wherein, when amounts of stimulation light that the white light source irradiates to photoreceptor cells of ipRGC, L cone, and M-cone among human photoreceptor cells are set as melanopic irradiance, L cone optic irradiance, and M-cone optic irradiance, respectively, a ratio of the stimulation light amounts is expressed by the following formula (1), and when the ratio corresponding to an emission spectrum of the above-described white light source is A, and the ratio corresponding to a spectrum of blackbody radiation having a same color temperature as that of the white light source is B, the following formula (2) is satisfied.
Melanopic irradiance/(L cone optic irradiance+M cone optic irradiance)  (1)
0.88≤A/B≤1.11  (2)