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荧光灯是完全符合要求的现代化光源。它比白炽灯效率高,光输出高,而且寿命长。光输出是确定光源经济性的基本参数,它是光通量与灯的功率的比值。但是,荧光灯在使用期间其光通量由于荧光粉特性变化、照明器脏污、室内表面反射系数降低以及灯具老化等有所降低。在运用过程中为了保证达到规定的照度值,在照明设计时须计入储备系数。按照(?)Ⅱ-4-79设计标准,荧光灯的储备系数为1.5。但是,它没有考虑供电电压降低使光源光通量降低的情况。试验和资料证实,在电压降低10％时,荧光灯的光通量也降低10％。
Fluorescent lamps are a modern light source that fully meets the requirements. It is more efficient than incandescent lamps, with high light output and long life. Light output is to determine the economy of the basic parameters of light, which is luminous flux and lamp power ratio. However, during use, the luminous flux of fluorescent lamps is reduced due to changes in phosphor properties, dirty luminaires, reduced indoor surface reflectance, and lamp aging. In the course of the application in order to ensure that the provisions of the illumination to achieve the value of lighting design must be included in the reserve factor. According to (?) Ⅱ-4-79 design criteria, the fluorescent lamp has a reserve factor of 1.5. However, it does not consider the case where the supply voltage is decreased to lower the luminous flux of the light source. Tests and data confirm that when the voltage is reduced by 10%, the luminous flux of the fluorescent lamp is also reduced by 10%.