Fluorescent tubes in the start-lighting operation, under the premise that the entire lamp power is not reduced. The luminous flux emitted by the fluorescent tube will gradually decrease with the starting time of ignition, and the brightness and illumination of the whole lamp will decrease. This phenomenon we call light decay of fluorescent tubes. The following Xiao Bian will give you a brief introduction about the national standards and applicable scope of fluorescent tubes.
Fluorescent tube light emission principle
The ability of a fluorescent tube to emit light is closely related to its internal structure. The interior of the tube itself is filled with argon, which is easily discharged, and a very small amount of mercury, which are essential substances for light emission. At the same time, the inner surface of the lamp tube is coated with a layer of fluorescent material, which can be used to improve the lighting effect. Moreover, the two-helix and three-helix electrodes made of tungsten wire in the lamp can well cooperate with the current to achieve the purpose of light emission. These are the prerequisites for the light emission of the lamp tube.
Fluorescent tube selection principle
1 Under any circumstance, the light pipe diameter (≤ 26mm) should be used, that is, T8, T5, etc., to replace the T12 lamp, which has obvious energy saving and environmental protection effects.
2 In any case, three-color fluorescent lamps should be used. Halogen fluorescent lamps should not be used. Tricolor lamps have the advantages of high luminous efficiency, good color development and longer life. Although the price is expensive (about twice as expensive), but because of its high luminous efficiency, not only energy-saving effect is good, reducing operating costs; but due to the reduction in the number of lamps, saving the cost of lamps and ballasts, instead of the lighting system The total initial construction cost decreased.
3 using high-power lamps: In the functional lighting locations (except decorative requirements), should choose not less than 4 feet (approximately 1200mm) long lamp, that is, T8 36W, T5 28W, its higher luminous efficiency.
4 In general, the medium color temperature lamp should be adopted: the color table of the light source (represented by the relevant color temperature) should be selected. In addition to the special requirements for architectural color, it can be generally determined according to the illuminance: simply put, the high illuminance (>750lx) should use the cold color temperature ( High color temperature), medium illuminance (about 200 to 1000 lx) with medium color temperature, low illuminance (≤200 lx) with warm color temperature (low color temperature). Warm warmth makes people feel comfortable in low light, and it feels hot in high light; cold warm light feels comfortable in high light and dim and cold in low light. The illuminance of most places is between 200 and 750 lx, and the use of a medium color temperature light source is better. Moreover, the fluorescence efficiency of medium and low color temperatures is higher than that of high color temperature lamps, which is also advantageous for energy conservation.
Fluorescent tube application
Suitable for fine work, need to correctly identify the color, high illumination requirements or long-term intense vision work place, the height of the suspension is less than 4m. Daylight fluorescent lamps are suitable for room lighting of natural lighting or lighting places requiring a comfortable environment. Fluorescent lamps should not be used in locations where switching is frequent, and indoor or outdoor locations with high or low ambient temperatures are not suitable for use.
The optimum ambient temperature for fluorescent lamps is 18 to 25°C. When the relative humidity of the environment is in the range of 75% to 80%, it will cause difficulty in starting. Fluorescent lamps must be used in conjunction with ballasts and starters of appropriate specifications, otherwise they will shorten the life of the lamp or make it difficult to start. The change of the power supply voltage of the fluorescent lamp should not exceed ± 5%, otherwise it will affect the light efficiency and life of the lamp.
The impact of light sources on initial investment should be considered. The efficiency of the light source has a direct impact on the number of lighting fixtures, electrical equipment costs, material costs, and installation costs of the lighting solution. The use of efficient light sources can reduce initial investment. The size of the light source also affects the size and cost of the lamp. Although the fluorescent lamp has a higher luminous efficiency, the size of the lamp is larger and the price is higher, and the initial investment will inevitably increase.
Fluorescent tube national standard
For the direct-pipe fluorescent tube on the market, it is a double-ended fluorescent lamp. The state requires its power to be marked on the external packaging box. The following are the power standards of the straight-tube fluorescent lamp: 4W, 6W, 8W, 12W, 15W, 20W, 30W, 36W, 40W, 65W, 80W, 85W and rare 125W. In addition, the country also requires that the average life of straight fluorescent tubes must reach more than 10,000 hours to qualify as straight-tube fluorescent tubes. Such lamps are generally found in large hotels and shopping malls, hospitals and other places.
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