A kind of LED filament luminous intensity standard lamp

Abstract

Provided is a luminous intensity standard lamp with LED filaments. The luminous intensity standard lamp with the LED filaments comprises a lamp holder and a lamp housing, wherein a glass stem, a filament support and the LED filaments are arranged in the lamp housing; the lamp housing is sealed and filled with heat-dissipating protective gas; the filament support is fixed on the glass stem; two guide wires are led out from the inside of the glass stem and are a positive pole connecting wire and a negative pole connecting wire respectively; the positive pole connecting wire and the negative pole connecting wire are respectively connected to two poles of the lamp holder; the LED filaments are fixed on the filament support, and are arrayed in a plane in the lamp housing in parallel in an evenly spaced manner; the center of the plane is consistent to the center of the lamp housing; the surface of the lamp housing is blackened and a diaphanous window is formed in the surface of the lamp housing; the diaphanous window is positioned in the center of the blackened surface; and the center of the diaphanous window is consistent to the center of the plane of the LED filaments. The luminous intensity standard lamp with the LED filaments is simple in structure, easy to mount and adjust, good in horizontal and vertical angle characteristic and uniform in illumination field distribution, and has the advantages of good stability, vibration resistance, high yield and low cost; and measurement result uncertainty caused by spectral mismatch can be reduced remarkably.

Description

technical field

[0001] The invention belongs to the field of light radiation measurement, and relates to an LED filament luminous intensity standard lamp, in particular to an LED filament luminous intensity standard lamp which can meet the photometric parameter measurement of a light-emitting diode (LED) light source. Background technique

[0002] The luminous intensity standard lamp is a standard measuring instrument for storing and transmitting the value of the luminous intensity unit. Luminous intensity unit candela (cd) is one of the seven basic units of SI, and other photometric units such as lm (luminous flux unit), lx (illuminance unit), cd / m 2 (Units of brightness) are derived from the unit of luminous intensity. The traditional luminous intensity standard lamp is an incandescent lamp, and its illuminants are arranged in a plane, and the illuminance distribution on the measurement plane is even. By designing the shape of the lamp shell, painting the surface black or...

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