Why does fluorescent lamp Suga glow on its own

You can swap the live and neutral wires of the fluorescent lamp.

No more to replace the brightener.

I'm an electrician.

The light emitted by fluorescent lamps belongs to low-pressure arc discharge light sources.

Fluorescent lamp: The lamp is filled with some special gas, and the wall of the lamp is coated with phosphor, and the light is generated due to discharge after the electricity is turned on. Fluorescent lamps:

It does not contain infrared rays, so its light is very gentle and does not hurt the eyes; Because it does not contain **, it is more energy-efficient to use; It also emits a lot of beautiful colored light. This is determined by the nature of the chemicals contained in phosphors, such as magnesium tungstate, which glows blue-white and glows reddish when coated with cadmium borate.

In 1974, Philips in the Netherlands was the first to successfully develop a phosphor that can emit red, green and blue light that is sensitive to the human eye. The development and application of trichromatic (also known as trichromatic) phosphor is an important milestone in the history of fluorescent lamp development.

The light emitted by fluorescent lamps is a cold light source. The light source with a lower temperature when emitting light is called a cold light source, the incandescent lamp and arc lamp at home are the hot light source, and the neon light lamp is a cold light source.

It has very good light source and variable flash characteristics. When an object emits light, its temperature is not higher than the ambient temperature, this kind of luminescence is called cold luminescence, and we call this kind of light source cold light source. The cold light source does not generate heat when working, avoiding a series of problems associated with heat accumulation.

The characteristic of the cold light source is that almost all other energy is converted into visible light, and there are few other wavelengths of light, while the thermal light source is different, in addition to visible light, there is also a large amount of infrared light, and a considerable part of the energy is converted into infrared light that does not contribute to lighting.

The light coming out of the thermal light source and the infrared filter should be about the same as the light emitted by the cold light source, because the infrared light has been filtered out. Light-emitting diodes are being produced, and triodes are being studied, which is a cold light source with a long life and a soft light, and is a light source that is expected to replace light bulbs.

Visible light. Because of its proximity to the sun's rays ...

The main reason is that there are so many types of lights. Different lamps have different luminous principles, and it is impossible to do everything. (I don't have that much knowledge) just try what I know, and I hope you can be full of it.

Lamps can be roughly divided into three categories in terms of the way they emit light: first, burning and emitting light; 2. Current overheating and luminescence; 3. The gas is stimulated by light.

In addition, luminaires such as diodes and liquid crystals that are blindly judged as indicator lights are not included in this classification, and they are rarely used for lighting, so they are not discussed. Burning and glowing lamps have been around since ancient times, that is, the use of fire. Ancient times used fire for lighting, and archaeological work has proven this.

You'll be familiar with this. In the 70s of the last century, most of China's areas had no electricity and relied on oil lamps for lighting. Current superheating glow is illuminated by the light generated by the heat generated by the electric current passing through the wire.

The common light bulb is a typical example of this.

There are many types of lamps in which the gas is stimulated. The basic principle is that the gas is decomposed into an ionic state under the action of an electric field to conduct electricity, and in the process produces a luminescence phenomenon. A typical phenomenon in nature is the Northern Lights.

The Northern Lights are the solar wind that sends a large number of charged particles into the atmosphere, which emits light after being stimulated. In addition, halos on ultra-high voltage power lines also belong to this phenomenon on foggy days. As for lightning, it is not certain, it is said that lightning is also a gas ion conduction.

Different gases are stimulated to produce different wavelengths of light, which makes the gas-emitting lamps have different shades of light. As you know, the most common is fluorescent lamps. He added mercury to the lamp, and the mercury in the gaseous state of the grinding was excited by the phosphor on the wall of the lamp during the conduction process, so that the light produced by it resembled fluorescence.

Therefore, the lamp should be called a fluorescent lamp. In addition, the energy-saving lamps that are now being used are also in this category.

The color spectrum of these lamps varies depending on the stimulated gas. For example, the sodium lamp used as a street lamp has a yellowing chromatogram; high-pressure mercury lamp chromatography; The chromatogram of iodine-tungsten lamps is closest to daylight.

Therefore, halogen elements are commonly used in gases filled with such gases, so some books call them halogen lamps. There is also a neon sign, which is also a gas-emitting lamp. I have limited knowledge of the principle of the excited light of the gas, and I cannot provide further answers.

At the beginning, because the temperature of the filament is lower, the resistance is less, and the power of the lamp is small, and after a while, the temperature of the filament rises, the resistance becomes larger, and the power of the bulb becomes larger, so the bulb becomes brighter.

Generally, fluorescent lamps have a characteristic, that is, they are not very bright when they are just pointed, and they reach the maximum brightness after a while, this is because the fluorescent lamp is emitted by the mercury vapor in the lamp tube to hit the phosphor, and when it is just started, the mercury vapor has not been completely vaporized, and the brightness of the lamp can only reach normal after it is completely vaporized, which is more obvious in winter.

This is also the case with energy-saving lamps, which use inductive ballasts and flash a few times when they are turned on because they need to be turned on. Electronic ballasts fluorescent lamps do not have this problem. If it's not a fluorescent lamp, it's probably going to be damaged!

Working characteristics of fluorescent lamps.

A high voltage is required when the lamp starts to ignite, and only a small current is allowed to pass through the normal glow, when the voltage at both ends of the lamp is lower than the supply voltage. This high voltage is provided by what we usually call a bubble starter. When the power is turned on, because the two metal sheets in the neon bubble of the starter are not connected, the power supply breaks down the neon gas conductive, then we see that the neon bubble glows, and the neon gas heats up when it conducts electricity, causing the bimetal sheet in the neon bubble (that is, the one we see bending) to decrease after being heated, and the two electrodes are turned on at the same time to pass a larger current.

Achieve the high voltage required for the fluorescent lamp to start. After that, because the neon gas in the neon bubble is no longer conductive and luminous after the bimetal sheet is turned on, the temperature drops rapidly, the bimetal sheet returns to its original state, and the power supply is quickly cut off, the current of the ballast suddenly changes from a large value to O, and produces a high self-inductive electromotive force, this self-inductive voltage is enough to penetrate the mercury vapor of the fluorescent lamp, so that the mercury vapor ionizes and conducts ultraviolet rays to produce ultraviolet rays and excites the fluorescent powder to shine, after the fluorescent tube is conductive, the voltage at both ends of the fluorescent tube drops (about 100V), and this voltage can no longer make the neon bubble conductive ( The breakdown voltage of the neon bubble is about 150V) and the bimetal sheet is no longer connected, and the fluorescent lamp can continue to emit light.

Ballast. The ballast is an element connected in series with the fluorescent tube, which is actually an inductance coil wound around the core of the silicon steel sheet, and its inductive reactance value is very large. The role of the ballast is:

limit the current of the lamp; Generate enough self-inductive electromotive force to make the lamp easy to discharge and ignite. Ballasts generally have two heads, but some ballasts have an extra coil around in order to easily ignite when the voltage is insufficient, so there are also ballasts with four heads.

Starter. The starter is a small glow tube filled with neon gas in a small glass tube and fitted with two electrodes. One of the electrodes is composed of two metals with different linear expansion coefficients (commonly called bimetal sheets), and when the two electrodes are separated, the bimetal sheets will bend due to heating when heated, so that the two electrodes will close automatically.

In particular, the traditional fluorescent lamp does not have a ballast, and it will only emit light when the voltage is larger, while the voltage in our country is 220V sinusoidal voltage, so the fluorescent lamp is constantly flashing when working, but people can't feel it, but the human eye is automatically adjusting, so that the eyes are tired. So try not to use fluorescent lamps, but use standard energy-saving lamps.

The switch of the fluorescent lamp has been turned off, why does the lamp still glow?

When the fluorescent lamp is produced, it is filled with some argon, nitrogen and other low-pressure gases; These gases will emit light after excitation, excitation self-excitation and external excitation, normal luminescence is self-excitation, external excitation is due to the continuous movement of some electric ions in the air, these electric ions will cause the argon ions in the fluorescent lamp to emit light. You can see that when the switch is disconnected, the fluorescent light will still come on. Regardless of other factors, such fluorescent tubes are easy to start, but the life is shorter, which is mainly related to its raw rubber mill production process, you change one to try it, the phenomenon you said is more common in summer and winter. ”