A luminous multiple glazing unit (400, 500, 600, 700) comprises: - a first flat glass element made of mineral or organic glass, with first and second main faces (11, 12); - a second flat glass element made of mineral or organic glass, with a main face, called the third face, lying opposite the first face, and another main face, called the fourth face; - the first and second glass elements being securely fastened to and spaced apart from each other; - an internal space, at least between the first and third faces, this space especially being evacuated or filled with a gas; - a spacer separating said first and second glass elements, at the periphery of the glazing unit; - at least one group of light-emitting diodes located in the internal space, the diodes being mounted on one or more mountings; - the diodes in said group each having a given main emission direction that is substantially parallel the first face; - a reflector that reflects the light emitted by said group of diodes, the reflector comprising a part fixed to the glazing unit in the internal space; and - a first luminous zone associated with the first glass element, the light originating from said group of diodes, said part of the reflector has a reflective area that makes an oblique angle to the first face characterized in that said reflective area is central, this reflective area being able to reflect, in a first position, and with an lateral reflective area (53, 51', 53'), what are called central rays of said group of diodes, including the main emission direction or the main emission directions, and forming at least 50% of the total flux emitted by the diodes in said group, these central rays being reflected onto the first luminous zone, said first luminous zone being provided with a first means for scattering light, which means receives the central rays, the reflector, optionally beyond the central area, extends until it makes contact with the first face or until there is a maximum play between the first face and the reflector of less than 5 mm and the part forming a region of or forming the reflector comprises: - a first flange comprising the central oblique area that is flat or concave toward the diodes and a lateral reflective zone, - prolonged by another flange, flat or concave toward the diodes, flange spaced apart from or on the third face. - a first flat glass element made of mineral or organic glass, with first and second main faces (11, 12); - a second flat glass element made of mineral or organic glass, with a main face, called the third face, lying opposite the first face, and another main face, called the fourth face; - the first and second glass elements being securely fastened to and spaced apart from each other; - an internal space, at least between the first and third faces, this space especially being evacuated or filled with a gas; - a spacer separating said first and second glass elements, at the periphery of the glazing unit; - at least one group of light-emitting diodes located in the internal space, the diodes being mounted on one or more mountings; - the diodes in said group each having a given main emission direction that is substantially parallel the first face; - a reflector that reflects the light emitted by said group of diodes, the reflector comprising a part fixed to the glazing unit in the internal space; and - a first luminous zone associated with the first glass element, the light originating from said group of diodes, - a first flange comprising the central oblique area that is flat or concave toward the diodes and a lateral reflective zone, - prolonged by another flange, flat or concave toward the diodes, flange spaced apart from or on the third face.