White light sodium lamp with high luminous efficiency and high color rendering

Abstract

The invention relates to a white light sodium lamp with high luminous efficiency and high color rendering, which belongs to the technical field of lighting equipment. According to the invention, an integrally-formed polycrystalline transparent Al2O3 ceramic lamp tube is used as a light-emitting container; and halide taking sodium as a main component and various rare metals as a light-emitting substance is filled. The effect of high lighting effect of the sodium element is exerted, and the characteristic of good color rendering property of various metallides is also exerted. Pleasant warm whitelight with the color rendering index of about 75 and the color temperature of about 3000k is formed, and the LED lamp is suitable for outdoor lighting mainly for roads. The invention discloses the white light sodium lamp with high luminous efficiency and high color rendering. The phenomena of violent jittering and drifting which are easily caused by a discharge arc in the using process of the bulb are effectively improved. The arc is prevented from drifting to the area near the tube wall. Blackening of the electrode area during use of the bulb is effectively prevented. Thermal breakdown of the polycrystalline aluminum oxide tube body caused by high temperature generated by shaking and drifting arcs is avoided, and the service life of the bulb is prolonged.

Description

technical field [0001] The invention relates to a white light sodium lamp with high light efficiency and high color rendering, belonging to the technical field of lighting equipment. Background technique [0002] High-pressure sodium lamps have the advantages of high luminous efficiency (luminous efficiency 120Lm / W), long life, and strong fog penetration ability. They are widely used in roads, expressways, airports, docks, docks, stations, squares, street intersections, industrial and mining enterprises, and parks. , Garden lighting and plant cultivation. However, the color temperature of the yellow light of the high-pressure sodium lamp is about 2000K, the color rendering index is low (Ra≈25), its ability to restore the color of the object itself is weak, and the color expression is poor. [0003] The high-pressure sodium lamp belongs to the high-intensity gas discharge lamp. Its luminous principle is to form a discharge through the breakdown of the sodium vapor gas throug...

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Problems solved by technology

However, the color temperature of the yellow light of the high-pressure sodium lamp is about 2000K, and the color rendering index is low (Ra≈25). Its ability to restore the color of the object itself is weak, and the color expression is poor.

[0003] The high-pressure sodium lamp belongs to the high-intensity gas discharge lamp. Its luminous principle is to form a discharge through the breakdown of the sodium vapor gas through the current. The luminescent substance filled in the lamp is pure metal sodium. Sodium is needed. These excess sodium metals are in liquid state when the lamp is working, and are extremely corrosive, which will corrode the tube wall, electrodes and solder it contacts, and the high-pressure sodium lamp tube will also appear prematurely. big case

[0004] There are ceramic metal halide lamps that improve the low color temperature and poor color performance of high-pressure sodium lamps by adding a variety of metal halides into the lamp. It is composed of two or three structural parts, that is, the so-called end plug, so that a right-angle chamfer is formed at the end (such as Chinese patents CN1669116A and CN101669189), which will lead to the deposition of high-temperature metal halides when the lamp is working, and the liquid state The metal halide will react with the ceramic tube at high temperature, resulting in the reduction of the discharge material, resulting in light decay and shortening the service life of the lamp

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