Fluorescent tube light-emitting principle Fluorescent tube selection principle and scope of application

Fluorescent lamp is a relatively energy-saving lamp. When it is used, the energy consumption is relatively low, the damage to human eyes is relatively small, and it is widely used in life. Its simple structure and stable performance have brought great convenience to people's lives, but its simple structure hides its very good working principle and performance. In the Netherlands, Philips first developed a phosphor that will emit red, green, and blue light that is sensitive to human eyes. The development and application of trichromatic phosphors is an important milestone in the history of the development of fluorescent lamps. While enjoying the benefits of fluorescent lamps, I believe many people do not understand the principle of fluorescent lighting . Don't worry, if you have this need, you may wish to follow me to learn about the principles of fluorescent tube lighting .

What is a fluorescent tube

Fluorescent lamps are what we call fluorescent lamps. This is because they are most often seen in the form of lamps. Its main working principle is to use low pressure mercury vapor, so that it can be successfully released after power. Ultraviolet light, when the phosphor in the bulb emits visible light of certain illuminance. From a professional point of view, fluorescent tubes belong to the low-pressure arc discharge light source, the most widely applicable one.

Compared with the traditional fluorescent lamps, there is also a lighting equipment called "polar fluorescent" on the market. Its advantages are long life and high light efficiency. From the appearance, the color rendering is also very prominent. .

Fluorescent tube specifications

In general there are 330cm, 460cm, 600cm, 800cm, 1200cm, red, white, orange, blue and so on.

Fluorescent tube power

The power of conventional fluorescent tubes 0.6m and 1.2m is generally 20 watts and 40 watts, respectively.

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 national standard

With the development of the market, there are more and more kinds of fluorescent tubes sold in shopping malls, and the models are becoming more and more complex. Let Xiao Bian scrutinize several common national standards of fluorescent lamps for you. I believe that I understand these standard conditions. After that, you will also increase your understanding of fluorescent tubes.

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.

In addition to straight-tube fluorescent tubes, self-ballasted fluorescent tubes have emerged to compensate for installation and cost deficiencies. This self-ballasted fluorescent tube is required to be installed in a qualified stent by national regulations. Security has become its most important point.

In addition to straight-tube fluorescent tubes, there are ring-shaped fluorescent tubes. Although they are not different from straight-tube fluorescent tubes in appearance, their power requirements are not as complex as straight tubes. The country requires its nominal power. The following three kinds can be: 22W, 32W, 40W.

Fluorescent tube selection principle

1. In any case, the light pipe diameter (≤ 26mm) should be used, ie 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. Halo 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. The use of high-power lamps: In 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. The general situation should adopt the medium color temperature lamp: the color table of the light source (represented by the relevant color temperature), in addition to the special requirements of the building color, generally can be determined according to the level of illumination: simply say, high illumination (>750lx) should use cold color temperature (High color temperature), Medium illumination (about 200 to 1000 lx) with medium color temperature, Low illumination (≤200lx) 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.

Editor's summary: fluorescent tubes have a very good use of effect and a long life, but in the use of the process should also pay attention to their own use, because when the power is turned on, the current will quickly enter the electrode, although the fluorescent lamp The performance has very good stability, but the wrong use method will greatly affect the fluorescent effect of fluorescent lamps.

Trichromatic fluorescent tubes LED fluorescent tubes Fluorescent tube specifications Fluorescent tubes Fluorescent lamps Price Fluorescent tube Lighting principle