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全路电气照明照度标准审查会议于1987年11月在京召开,会上北京站介绍了采用天津灯具厂生产的GZJ4-31多功能投光灯照明效果显著。这种新型GZJ4-31投光灯具有多功能性,高压汞灯、高压钠灯、镝灯上均可安装,250W和400W功率的灯炮都适用,光束角可连续调整。当用400W高压钠灯时,其峰值光强可达到694938cd,总光通为259061m,灯具效率达到62％。该灯具左右可调180度、仰角40度、俯角30度并装有刻度盘。其底座安装眼孔尺寸与812型灯具相同,如更换812型灯具为
The whole road illumination lighting standard review meeting held in Beijing in November 1987, Beijing Railway Station at the meeting introduced the use of Tianjin Lighting Factory production GZJ4-31 multi-function floodlight lighting effect is significant. The new GZJ4-31 floodlight features versatility. High pressure mercury vapor lamps, high pressure sodium lamps, and dysprosium lamps are all available. 250W and 400W lamps are suitable for use with beam angle adjustments. When using 400W high-pressure sodium lamp, the peak light intensity can reach 694938cd, total luminous flux is 259061m, lamp efficiency reaches 62%. The lamp is adjustable 180 degrees left and right, elevation 40 degrees, depression angle 30 degrees and equipped with a dial. The size of the base mounting eye and 812-type lamps the same, such as the replacement of 812-type lamps