Abstract: An ink set of radiation curable ink jet compositions, includes: an under layer ink; and an over layer ink, and the under layer ink contains, as a polymerizable compound, 80.0 percent by mass or more of a monofunctional polymerizable compound with respect to a total mass of polymerizable compounds and contains 55.0 percent by mass or more of a polymerizable compound having a nitrogen heterocyclic structure and/or a polymerizable compound having a hydroxy group in total with respect to the total mass of the polymerizable compounds.

Abstract: A luminaire is provided. A main surface of a light-guiding panel included in the luminaire includes a reflecting area having a plurality of approximately conical recesses. An angle ? formed by a lateral surface of each of the recesses and the main surface of the light-guiding panel satisfies a condition defined by a distance D from a center position of a light source to a center position of the reflecting area, a distance H from an illumination target surface to the center position of the light source, an angle ? which the light-guiding panel forms with a horizontal plane, a refractive index n of the light-guiding panel, and a surface roughness Ra of the lateral surface of each of the recesses.

Abstract: A luminaire is provided. A main surface of a light-guiding panel included in the luminaire includes a reflecting area having a plurality of approximately conical recesses. An angle ? formed by a lateral surface of each of the recesses and the main surface of the light-guiding panel satisfies a condition defined by a distance D from a center position of a light source to a center position of the reflecting area, a distance H from an illumination target surface to the center position of the light source, an angle ? which the light-guiding panel forms with a horizontal plane, a refractive index n of the light-guiding panel, and a surface roughness Ra of the lateral surface of each of the recesses.

Abstract: A light-emitting module includes: a board; and a plurality of light sources arranged in a two-dimensional array on the board and including a plurality of color temperatures. In a first direction of the two-dimensional array, light sources having a uniform color temperature are successively arranged. The number of light sources having a uniform color temperature and successively arranged in each array line in the first direction is less than or equal to half of the total number of light sources in the array line in the first direction.

Abstract: In a plant growing system, a first light source irradiates a plant with light having a peak wavelength in a range from 380 to 560 nm and a peak wavelength in a range from 560 to 680 nm and a second light source irradiates the plant with far-red light having a peak wavelength in a range from 685 to 780 nm. Further, a control unit controls the first and the second light source to perform respective irradiation operations and a time setting unit sets a first and a second time zone in which the control unit controls the first and the second light source to perform the respective irradiation operations. The first time zone ranges from a first predetermined time before sunset to a second predetermined time after sunset, and the second time zone starts after the first light source completes its irradiation operation.

Abstract: A light-emitting module includes: a board; and a plurality of light sources arranged in a two-dimensional array on the board and including a plurality of color temperatures. In a first direction of the two-dimensional array, light sources having a uniform color temperature are successively arranged. The number of light sources having a uniform color temperature and successively arranged in each array line in the first direction is less than or equal to half of the total number of light sources in the array line in the first direction.

Abstract: An illumination apparatus includes light sources; a light guide plate guiding lights from the light sources; a housing holding the light sources and the light guide plate; and an apparatus attachment part. The light sources are arranged around the apparatus attachment part 5, and the light guide plate 3 is provided outside the apparatus attachment part to face the housing and cover a front side of the light sources. The light guide plate includes a main light guide part guiding lights from the light sources toward an outer periphery of the light guide plate and scattering and emitting the lights to a surface of the main light guide part; and an auxiliary light guide part integrated with the main light guide part at an inner peripheral side of the main light guide part and guiding and emitting the lights from the light sources toward the central portion of the housing.

Abstract: An optical member for refracting light emitted from a light source and projecting the light from a light projecting surface thereof includes a plurality of concave or convex portions formed on the light projecting surface. The concave or convex portions are concentrically arranged on a plurality of circles having a common center point. The concave or convex portions on the circles adjoining to each other are arranged in different phase positions with respect to radial lines extending from the center point.

Abstract: An illumination device includes a plurality of light sources for emitting light and an optical member arranged in front of the light sources to control distribution of the light emitted from the light sources. The optical member includes a plurality of lens portions having storage recess portions formed in alignment with the light sources to accommodate the light sources and a plurality of ribs extending laterally from the lens portions to fix the lens portions to a substrate holding the light sources, each of the lens portions having a light distribution control portion formed in a rear opening edge of each of the storage recess portions to distribute frontward the light emitted from the light sources toward the ribs.

Abstract: An illumination apparatus includes light sources; a light guide plate guiding lights from the light sources; a housing holding the light sources and the light guide plate; and an apparatus attachment part. The light sources are arranged around the apparatus attachment part 5, and the light guide plate 3 is provided outside the apparatus attachment part to face the housing and cover a front side of the light sources. The light guide plate includes a main light guide part guiding lights from the light sources toward an outer periphery of the light guide plate and scattering and emitting the lights to a surface of the main light guide part; and an auxiliary light guide part integrated with the main light guide part at an inner peripheral side of the main light guide part and guiding and emitting the lights from the light sources toward the central portion of the housing.

Abstract: An illumination device includes a plurality of light sources for emitting light and an optical member arranged in front of the light sources to control distribution of the light emitted from the light sources. The optical member includes a plurality of lens portions having storage recess portions formed in alignment with the light sources to accommodate the light sources and a plurality of ribs extending laterally from the lens portions to fix the lens portions to a substrate holding the light sources, each of the lens portions having a light distribution control portion formed in a rear opening edge of each of the storage recess portions to distribute frontward the light emitted from the light sources toward the ribs.

Abstract: An optical member for refracting light emitted from a light source and projecting the light from a light projecting surface thereof includes a plurality of concave or convex portions formed on the light projecting surface. The concave or convex portions are concentrically arranged on a plurality of circles having a common center point. The concave or convex portions on the circles adjoining to each other are arranged in different phase positions with respect to radial lines extending from the center point.