US 11,808,443 B2
Lighting device, lighting system and use thereof
Johannes Petrus Wilhelmus Baaijens, Eindhoven (NL); Wiebe Wagemans, Eindhoven (NL); Bianca Maria Irma Van Der Zande, Eindhoven (NL); Kars-Michiel Hubert Lenssen, Eindhoven (NL); Martinus Petrus Joseph Peeters, Eindhoven (NL); and Remy Cyrille Broersma, Eindhoven (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 15/534,242
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Nov. 26, 2015, PCT No. PCT/EP2015/077785
§ 371(c)(1), (2) Date Jun. 8, 2017,
PCT Pub. No. WO2016/096367, PCT Pub. Date Jun. 23, 2016.
Claims priority of application No. 14198292 (EP), filed on Dec. 16, 2014.
Prior Publication US 2018/0073712 A1, Mar. 15, 2018
Int. Cl. F21V 23/04 (2006.01); F21V 9/40 (2018.01); F21S 6/00 (2006.01); F21V 33/00 (2006.01); H05B 45/20 (2020.01); H05B 45/22 (2020.01); F21V 9/20 (2018.01); H05B 33/08 (2020.01); F21Y 115/10 (2016.01); F21Y 113/13 (2016.01)
CPC F21V 23/04 (2013.01) [F21S 6/003 (2013.01); F21V 9/20 (2018.02); F21V 9/40 (2018.02); F21V 33/0008 (2013.01); H05B 45/20 (2020.01); H05B 45/22 (2020.01); F21Y 2113/13 (2016.08); F21Y 2115/10 (2016.08)] 13 Claims
OG exemplary drawing
 
1. Lighting device operable in a first and a second operation state for controlling exposure to blue light, said lighting device comprising:
a light source comprising blue LEDs and dimmable green and red LEDs, said light source being configured to generate source light of a white light emission spectrum having a color correlated temperature (CCT) in a range of 2500-20000K;
a control unit being configured to control a lighting element being at least one of a tunable light filter, switchable lighting element, dimmable lighting element for tuning of the source light with respect to a ratio between a blue light emission peak in a wavelength range of 460-490 nm and a second light emission peak in a wavelength range of 430-460 nm, said tuning further comprises an adaption in the emission intensity in the green to red part of the spectrum by controlling the dimmable green and red LEDs to compensate a shift in the CCT of the white emission spectrum caused by a tuning of the ratio between the first and second blue light emission peak upon a switch from the first to the second operation state, such that the CCT of the white emission spectrum is without change, wherein the control unit receives a measured spectral composition of an initial spectrum and calculates the CCT and wherein a follow-up light spectrum is adapted in emission intensity using only the dimmable green and red LEDs, to compensate for and/or reverse an effect on and/or the shift of the CCT caused by a difference in the second emission peak between the initial and follow-up spectrum.