US Patent No. 10,299,441

HORTICULTURE LIGHTING DEVICE AND A METHOD TO STIMULATE PLANT GROWTH AND BIO-RHYTHM OF A PLANT


Patent No. 10,299,441
Issue Date May 28, 2019
Title Horticulture Lighting Device And A Method To Stimulate Plant Growth And Bio-rhythm Of A Plant
Inventorship Rob Franciscus Maria Van Elmpt, Eindhoven (NL)
Henricus Marie Peeters, Eindhoven (NL)
Rifat Ata Mustafa Hikmet, Eindhoven (NL)
Martinus Petrus Joseph Peeters, Eindhoven (NL)
Dirk Veldman, Eindhoven (NL)
Paulus Albertus Van Hal, Eindhoven (NL)
Assignee SIGNIFY HOLDING B.V., Eindhoven (NL)

Claim of US Patent No. 10,299,441

1. A horticulture lighting device, comprising:a first solid state light source arranged to emit direct red light having a maximum emission wavelength of 600 to 680 nm, preferably 640 to 680 nm,
a wavelength converting member arranged to receive at least part of said direct red light emitted from said first solid state light source and to convert said received direct red light to far-red light having a maximum emission wavelength of 700 to 760 nm, preferably 720 to 760 nm,
an additional solid state light source arranged to emit said direct red light, and
a reflective panel arranged in between the first solid state light source and said additional light source to reduce light impinging on said wavelength converting member from said additional light source;
wherein each of said solid state light sources, the reflective panel, and said wavelength converting member is assembled to a single unit; and,
wherein a ratio of said direct red to said far-red light emitted from said lighting device is set by adjusting the fraction of said direct red light impinging on said wavelength converting member from said first solid state light source and by independently regulating the intensity of light emitted by each of said solid state light sources.