US Patent No. 10,448,478

LED STRIP, LED LUMINAIRE, AND A METHOD OF MANUFACTURING THEREOF


Patent No. 10,448,478
Issue Date October 15, 2019
Title Led Strip, Led Luminaire, And A Method Of Manufacturing Thereof
Inventorship Joris Hubertus Antonius Hagelaar, Nuenen (NL)
Abraham Vamattathil Scaria, Eindhoven (NL)
Assignee SIGNIFY HOLDING B.V., Eindhoven (NL)

Claim of US Patent No. 10,448,478

1. A lighting assembly for emitting substantially white light of a controllable correlated color temperature, the lighting assembly comprising:a plurality of groups of light sources, wherein, each group comprises a first light source, a second light source and a third light source,
said first light sources are for emitting a first light having a first color point and a first correlated color temperature, the first color point being within 7 SDCM from a black body line, the first correlated color temperature being larger than 5000 Kelvin,
said second light sources are for emitting a second light having a second color point and a second correlated color temperature, the second color point being within 7 SDCM from the black body line, the second correlated color temperature being smaller than 2250 Kelvin, and
said third light sources are for emitting a greenish light, the greenish light having a third color point in the CIE 1931 XYZ color space within an intersection of half spaces y>=1.04 x and y>=?0.0694x+0.4525, each third light source being capable of emitting a specific maximum flux of light under predefined standard operation conditions, the specific maximum flux of each individual third light source maximally deviates 35% from an average maximum flux under the predefined standard operation conditions of all third light sources of the plurality of groups and the specific maximum flux of at least one of the third light sources deviates more than 10% from the average maximum flux under the predefined standard operation conditions of all third light sources of the plurality of groups; and
a controller configured to generate a first control signal for controlling the first light sources, a second control signal for controlling the second light sources and a third control signal for controlling the third light sources, the first control signal, the second control signal and the third control signal control an amount of light to be emitted by said first light sources, said second light sources and said third light sources, respectively,
the controller further configured to generate said respective control signals to obtain, in use, a combined light emission comprising the first light, the second light and the greenish light, the combined light emission having a controllable color point close to the black body line.