A horticultural lighting fixture configured to provide horticultural lighting to a growth chamber receiving zero sunlight therein during use, wherein the horticultural lighting fixture comprises a first emission source comprising a LED and/or a quantum dot configured to emit main spectral characteristics in the photosynthetically active radiation, PAR, spectral area, wherein a) the main spectral characteristics has first spectral characteristics including a peak in the wavelength range from 600 nm to 700 nm and arranged to exhibit a full width of half maximum of at least 50 nm or more; b) the main spectral characteristics has second spectral characteristics with a maximum of 50 nm full width at half maximum and arranged to exhibit a peak wavelength in the range from 440 nm to 500 nm; c) at least part of the emission in a wavelength range of 600 nm to 800 nm is generated using wavelength up-conversion of light emitted by the LED or quantum dot having a wavelength between 300 nm and 500 nm, where by wavelength up-conversion is meant the changing of incoming absorbed light to emitted light of longer wavelengths; and d) at least a part or the whole of the emission of the main spectrum at wavelengths of 500 nm to 600 nm is arranged to be minimized and/or omitted and/or to be reduced below the intensity in 400 nm to 500 nm band and below the intensity in 600 nm to 700 nm band, and a second emission source comprising at least one second LED and/or quantum dot, characterized in that the second emission source is configured to emit at least one side spectral characteristics selected from first spectral characteristics in 700 nm to 800 nm area and second spectral characteristics in 300 nm to 400 nm area, and in that intensities of respective emissions of the first emission source and the second emission source are independently adjustable. a) the main spectral characteristics has first spectral characteristics including a peak in the wavelength range from 600 nm to 700 nm and arranged to exhibit a full width of half maximum of at least 50 nm or more; b) the main spectral characteristics has second spectral characteristics with a maximum of 50 nm full width at half maximum and arranged to exhibit a peak wavelength in the range from 440 nm to 500 nm; c) at least part of the emission in a wavelength range of 600 nm to 800 nm is generated using wavelength up-conversion of light emitted by the LED or quantum dot having a wavelength between 300 nm and 500 nm, where by wavelength up-conversion is meant the changing of incoming absorbed light to emitted light of longer wavelengths; and d) at least a part or the whole of the emission of the main spectrum at wavelengths of 500 nm to 600 nm is arranged to be minimized and/or omitted and/or to be reduced below the intensity in 400 nm to 500 nm band and below the intensity in 600 nm to 700 nm band, and a second emission source comprising at least one second LED and/or quantum dot, characterized in that the second emission source is configured to emit at least one side spectral characteristics selected from first spectral characteristics in 700 nm to 800 nm area and second spectral characteristics in 300 nm to 400 nm area, and in that intensities of respective emissions of the first emission source and the second emission source are independently adjustable. <EOS>