The inventive concept relates to illumination equipment for underwater photography and/or videography. The operating structure of the inventive concept achieves such an illumination of the environment, items, and living beings under water that affords optimum color at optimum distances for perception by an average person. The illumination device comprises a plurality of light emitters, which are configured to illuminate the environmental area of the illumination equipment. The illumination equipment includes at least one device for spectrum measurement that is configured to acquire information about the optical spectrum of the ambient illumination within the environmental area, and control means for modifying the emissions of the light emitters based on the acquired information about the optical spectrum. The light emitters may be at least one or more of red, blue, green, and white light emitters. The light spectrum is measured using an RGB-sensor formed by at least three illuminance measurement sensors.

An optical converter wheel, a method of producing, and a method of using are provided. The wheel includes an inorganic converter material that converts light of a first wavelength into light of a second wavelength and a converter substrate. The converter substrate has a coefficient of thermal expansion CTE.sub.KS of 4 to 18×10.sup.−6 1/K in a range from 20° C.-300° C. and a thermal conductivity of at least 50 W/mK at 20° C.

An optical converter wheel, a method of producing, and a method of using are provided. The wheel includes an inorganic converter material that converts light of a first wavelength into light of a second wavelength and a converter substrate. The converter substrate has a coefficient of thermal expansion CTE.sub.KS of 4 to 18×10.sup.−6 1/K in a range from 20° C.-300° C. and a thermal conductivity of at least 50 W/mK at 20° C.

A wavelength conversion element according to an embodiment of the present disclosure includes: a phosphor layer; a refrigerant; a refrigerant transport member; and a housing. The phosphor layer includes a plurality of phosphor particles. The phosphor layer has a gap therein. The refrigerant cools the phosphor layer. The refrigerant transport member is provided in contact with the phosphor layer. The refrigerant transport member circulates the refrigerant. The phosphor layer, the refrigerant, and the refrigerant transport member are encapsulated in the housing.

A light source system, comprising: a wavelength conversion layer (102, 202) used for receiving exciting light (L3) and generating excited light (L2); a transparent thermal conduction substrate (104, 204) used for supporting the wavelength conversion layer (102, 202), and an excitation light source which emits the exciting light (L3) from a side of the wavelength conversion layer (102, 202) to the wavelength conversion layer (102, 202); and a red light source which emits red light (L1) from a side of the transparent thermal conduction substrate (104, 204) to the wavelength conversion layer (102, 202). The light source system can effectively solve the problem of insufficient red light in fluorescent powder excitation technology.

A light source system, comprising: a wavelength conversion layer (102, 202) used for receiving exciting light (L3) and generating excited light (L2); a transparent thermal conduction substrate (104, 204) used for supporting the wavelength conversion layer (102, 202), and an excitation light source which emits the exciting light (L3) from a side of the wavelength conversion layer (102, 202) to the wavelength conversion layer (102, 202); and a red light source which emits red light (L1) from a side of the transparent thermal conduction substrate (104, 204) to the wavelength conversion layer (102, 202). The light source system can effectively solve the problem of insufficient red light in fluorescent powder excitation technology.

An upside-down type LED light source for supplemental lighting for plants includes a substrate, an LED chip, a first glue powder layer, and a second glue powder layer; the LED chip is mounted on one surface of the substrate; the LED chip being a blue LED chip; the first glue powder layer is disposed between the LED chip and the substrate, and the LED chip is covered by the second glue powder layer; the LED chip is fixed on the substrate through the first glue powder layer, wherein the first glue powder is a mixture of a glue and red phosphors; and the second glue powder layer covers the LED chip and completely wraps the LED chip; the second glue powder layer is one of a mixture of the glue and yellow phosphors, and a mixture of the glue and infrared phosphors.

A vehicular lamp configured to radiate illumination light and measuring light toward a side in front of a vehicle includes a light source unit configured to emit visible light that becomes illumination light and measuring light, and the light source unit emits the illumination light and the measuring light while alternately switching the illumination light and the measuring light at a cycle in which at least the measuring light is not visually recognized by a driver.

An aroma diffuser with changing of rotating pattern lighting uses a patterned light-transmitting film designed to cover the outside of a light-emitting device, and one side of the patterned light-transmitting film is combined with a rotating ring driven by a transmission device. The light-emitting device radiates the light source to the patterned light-transmitting film, and the light effect of the pattern is transmitted to the outer light-transmitting casing through the patterned light-transmitting film to display the aesthetics of patterned light and shadow. The rotating ring can rotate the patterned light-transmitting film to change the lighting effect of its pattern or text. The light-emitting device can use different colors to generate light to reflect the graphics of the patterned light-transmitting film as colored light and shadow displayed in the light-transmitting casing, thereby producing light decoration or lighting and heating the aroma substances filled in the aroma diffuser.

An aroma diffuser with changing of rotating pattern lighting uses a patterned light-transmitting film designed to cover the outside of a light-emitting device, and one side of the patterned light-transmitting film is combined with a rotating ring driven by a transmission device. The light-emitting device radiates the light source to the patterned light-transmitting film, and the light effect of the pattern is transmitted to the outer light-transmitting casing through the patterned light-transmitting film to display the aesthetics of patterned light and shadow. The rotating ring can rotate the patterned light-transmitting film to change the lighting effect of its pattern or text. The light-emitting device can use different colors to generate light to reflect the graphics of the patterned light-transmitting film as colored light and shadow displayed in the light-transmitting casing, thereby producing light decoration or lighting and heating the aroma substances filled in the aroma diffuser.