公开(公告)号：US20170352787A1

公开(公告)日：2017-12-07

申请号：US15610782

申请日：2017-06-01

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Naoko TAKEI ,  Makoto YAMADA ,  Tooru SUZUKI

IPC: H01L33/50 ,  F21S8/08 ,  H01L33/62 ,  H01L33/48 ,  H01L33/54 ,  F21W111/023

CPC classification number: H01L33/504 ,  F21S8/086 ,  F21W2111/023 ,  H01L33/486 ,  H01L33/54 ,  H01L33/62 ,  H01L2224/48091 ,  H01L2224/48247 ,  H01L2224/48257 ,  H01L2224/49107 ,  H01L2924/181 ,  H01L2924/00014 ,  H01L2924/00012

Abstract: A street lamp includes a light emitter that is disposed at a height of at least 5 m and at most 15 m above a road and emits white light to illuminate the road. The white light has: a correlated color temperature in a range from 5000 K to 6500 K; a chromaticity deviation in a range from −10 to +10; a scotopic/photopic (S/P) ratio of at least 2.0, the S/P ratio being a ratio of a scotopic luminous flux to a photopic luminous flux; and an average horizontal illuminance of at least 5 lx at an illumination area on the road illuminated with the white light.