A warning light having light sources for emitting light of different colors via at least a lens, where one of the colors is violet and other of the colors is non-violet along a spectrum of visible illumination. A controller selectably activates the light source(s) emitting non-violet light to provide visible warning signals, and the light source(s) emitting violet light to provide fluorescent inducing signals dominantly along the spectrum of visible illumination which causes any object or surface having phosphors to fluoresce in order to enhance their visibility in low or zero ambient light environments. The lens and/or optional filter, or coating along the lens, filters or blocks ultraviolet light to shift the peak wavelength of violet light source(s) so that fluorescent inducing signals are dominantly or more dominantly of higher wavelengths along the spectrum of visible violet illumination to human eyes. Single and dual warning light housings embodiments are provided.

A light emitting device (100) includes a phosphor application printed wiring board (30) in which a phosphor layer (36) is provided on a substrate surface, a first light emitting unit (20A) provided in the phosphor application printed wiring board (30) and outputting light having a peak wavelength in a wavelength region of visible light, a second light emitting unit (20B) provided in the phosphor application printed wiring board (30) and outputting light having a peak wavelength in a range of 315 nm to 470 nm (that is, near-ultraviolet ray), a photocatalyst unit (160) including a substance (photocatalyst) that undergoes a photocatalytic reaction with light of a second light emitting unit (20B), and a cover member (110) (lamp cover) that covers the phosphor application printed wiring board (30). The phosphor layer (36) is provided separately from the first light emitting unit (20A) and the second light emitting unit (20B).

The invention provides an illumination system arranged to illuminate a space for rearing a flock of birds, wherein the illumination system comprises: a visible light source configured to emit visible light; an ultraviolet light source configured to emit ultraviolet light; a controller configured to: (i) entrain a circadian rhythm of the flock of birds by controlling the visible light source to emit the visible light for a predetermined period of light, and not to emit the visible light for a predetermined period of dark; (ii) control the ultraviolet light source to emit the ultraviolet light at an ultraviolet light intensity for at least one subperiod within the predetermined period of dark, wherein the ultraviolet light comprises a peak wavelength within the UV-A wavelength range.

The present invention generally relates to the field of a lighting unit (100), and in particular to a lighting unit (100) that is suitable for being part of a suspended ceiling (0001). The lighting unit (100) comprises one or more lighting tiles (1000) and an interface component (2000). The interface component (2000) forms at least a portion of a grid system (1020) for the suspended ceiling (0001) and for supporting the lighting tile (1000). The interface component (2000) comprises a central support portion (2001) having a first end (2002) facing a ceiling (0002), and a second end (2003) having a first flange (2004) and a second flange (2005) that are opposing each other. At least one of the first flange (2004) and the second flange (2005) comprises a through-hole (2006) that serves as an aperture for at least part of a device (1001) that is arranged at one of the peripheries (1002, 1003) of the lighting tile (1000) when the first flange (2004) is configured to support a first lighting tile when the first lighting tile is installed in the suspended ceiling (0001) and/or the second flange (2005) is configured to support a second lighting tile when the second lighting tile is installed in the suspended ceiling (0001).

The present invention relates to a disinfecting lighting device (1) arranged to emit device light. The disinfecting lighting device comprises at least one disinfecting light module (2, 2) comprising at least one first light source (3, 3) providing a first light in the UV wavelength range and a second light in the visible wavelength range, the second light having a first color point x.sub.1,y.sub.1. The disinfecting lighting device further comprises at least one second light source (4) configured to provide a third light in the visible wavelength range, the third light having a second color point x.sub.2,y.sub.2. An optical element (5) is arranged in a light-receiving relationship with the at least one disinfecting light module (2, 2) and the second light source (4). The first color point xi,yi and the second color point x.sub.2,y.sub.2 are substantially equivalent.

A connected lighting system that includes a substrate defining a broad face, a first set of light emitting elements, and a second set of light emitting elements. Each light emitting element of the second set of light elements may be configured to emit light having a fixed color parameter different from a first color parameter of the first set of lighting elements. The first and second sets of light emitting elements may be arranged at at least two different contiguous portions of the broad face of the substrate. A processor may be configured to control the first set of light emitting elements with a predetermined intensity and control relative intensities of one or more of the second set of light emitting elements to cooperatively emit light having a first color parameter value.

The present invention relates to a light-emitting diode (LED) filament (1) configured to provide LED filament light and comprising an elongated carrier (2) comprising a first surface (3) and a second surface (3) arranged opposite to the first surface (3). The LED filament (1) further comprises a plurality of first light-emitting diodes (4). LEDs, distributed along the first surface (3) of the elongated carrier (2), the plurality of first LEDs (4) being configured to emit a first LED light having a dominant peak wavelength within a first wavelength range, and a plurality of second light-emitting diodes (5), LEDs, distributed along the second surface (3) of the elongated carrier (2), the plurality of second LEDs (5) being configured to emit a second LED light having a dominant peak wavelength within a second wavelength range being different from the first wavelength range. The first wavelength range is in the visible wavelength range and the second wavelength range is in the UV wavelength range and/or violet wavelength range.

Some examples herein include systems and methods of creating standards of gemstones of various classifications, which may display certain characteristics of the various classifications when excited by ultraviolet radiation and fluoresce in response. In some examples, a set of standards are created using fluorescent material, filters, and a radiation source to compare against a sample gemstone. In some examples, specific Light Emitting Diodes are selected to illuminate the gemstone samples under analysis.

An air purification device (100), a lighting device and a luminaire are provided. The air purification device comprises an air inlet (132), an air outlet (134), a photocatalytic volume (150), a first solid state light emitter (102) and a second solid state light emitter (122). The air inlet receives an air flow (140). The photocatalytic volume comprises a photocatalytic material and the air flow flows through the photocatalytic volume to contact some air with the photocatalytic material. The photocatalytic volume is between the air inlet and the air outlet. The photocatalytic material is a catalyst under the influence of UV light in photoreactions between gasses in the air flow. The first solid state light emitter emits UV light towards the photocatalytic volume. The second solid state light emitter emits deep blue light towards the photocatalytic volume. The deep blue light has a peak wavelength in between (400) nanometer and (450) nanometer.

A lighting system that irradiates a fresh product with light is provided. The lighting system includes a white light source that emits white light and a near-infrared light source that emits near-infrared light having at least one peak wavelength in a wavelength range of from 700 nm to 1100 nm, inclusive. The near-infrared light at least partially overlaps an area illuminated by the white light on a placement surface on which the fresh product is placed.