Detailed knowledge of LED fluorescent lamps
LED fluorescent lamp features
LED fluorescent lamp is characterized by high quality, durability, and energy saving. It has a large projection angle adjustment range. The brightness of 15W is equivalent to that of an ordinary 40W fluorescent lamp. It is resistant to high temperature, moisture, water, and leakage. The operating voltage is: 110V, 220V optional, and the outer cover can be made of glass or PC. The lamp holder is the same as an ordinary fluorescent lamp.
The LED fluorescent lamp adopts the latest LED light source technology and digital appearance design, which can save more than 70% of electricity. The intensity of 12W LED fluorescent lamp is equivalent to 40W fluorescent tube. The life of LED fluorescent lamp is more than 10 times that of ordinary fluorescent tube. It is almost maintenance-free and unnecessary. Replace lamps, ballasts, and starters frequently. The green and environmentally friendly semiconductor electric light source has soft light and pure spectrum, which is beneficial to the user's vision protection and physical health. The 6000K cold light source gives people a visually cool feeling, and the humanized illuminance difference design helps to concentrate and improve efficiency.
1. Strong applicability, improved adaptability and reliability in various harsh environments indoors and outdoors
2. Rich colors: It is composed of three primary colors (red, green, blue) display unit cabinets, which enables the electronic screen to display dynamic images with rich colors, high saturation, high resolution and high display frequency
3. High brightness: Ultra-high brightness LED is used, and it is still clearly visible from a long distance under strong sunlight
4. Good effect: using non-linear correction technology, the image is clearer and the sense of hierarchy is stronger
5. Strong reliability: using static scanning technology and modular design technology, higher reliability and stability
6. Diversified display modes: support multiple display modes.
Ordinary fluorescent lamp features
There is a filament at both ends of the ordinary fluorescent lamp. The tube is filled with traces of argon and thin mercury vapor. The inner wall of the tube is coated with fluorescent powder. When the gas between the two filaments is conductive, it emits ultraviolet rays, so that the fluorescent powder emits softly. Visible light.
Common fluorescent lamp work characteristics: when the lamp starts to ignite, a high voltage is required, and only a small current is allowed to pass when it is normally lit. At this time, the voltage at both ends of the lamp is lower than the power supply voltage.
The two ends of the ordinary fluorescent tube are equipped with filaments, and the inner wall of the glass tube is coated with a uniform thin phosphor powder. After the tube is evacuated to a vacuum of 10-3-10-4 mmHg, a small amount of inert gas is filled, and a small amount of liquid is also injected. mercury. The inductive ballast is an iron core inductive coil. The nature of the inductance is that when the current in the coil changes, it will cause changes in the magnetic flux in the coil, resulting in induced electromotive force. Its direction is opposite to the direction of the current, thus hindering The current changes.
The starter acts as a switch in the circuit. It is formed by a neon gas discharge tube in parallel with a capacitor. The function of the capacitor is to eliminate electromagnetic interference to the power supply and form a vibrating circuit with the ballast to increase the starting pulse voltage amplitude. . One electrode in the discharge tube is composed of a bimetallic sheet, which is heated by neon bulb discharge, so that when the bimetallic sheet is opened and closed, it causes a sudden change in the current of the inductive ballast and generates a high-voltage pulse to be applied to both ends of the tube.
When the ordinary fluorescent lamp is connected to the circuit, the glow discharge starts between the two electrodes of the starter, causing the bimetallic piece to heat and expand and contact the static contact electrode, so the power supply, ballast, filament and starter form a closed circuit. The current preheats the filament. When the heating time is 1-3 seconds, the glow discharge between the two electrodes of the starter is extinguished, and then the bimetallic plate cools and disconnects from the static contact. When the two electrodes are disconnected In an instant, the current in the circuit suddenly disappears, so the ballast generates a high-voltage pulse, which is superimposed with the power supply and applied to both ends of the lamp tube to ionize the inert gas in the lamp tube and cause arc discharge. During the normal lighting process, The self-inductance of the ballast also plays a role in stabilizing the current in the circuit.
Through the comparison of the attributes of LED fluorescent lamps and ordinary fluorescent lamps, the conclusion is drawn:
Compared with ordinary fluorescent lamps, LED fluorescent lamps have the following advantages:
Energy saving, long life, good applicability, due to the small size of a single LED, it can be made into any shape, short response time, environmentally friendly, no harmful metals, easy to recycle waste, brilliant colors, pure luminous colors, narrow spectral range, and It can be mixed into colorful or white light through the three primary colors of red, green and blue.
Compared with ordinary fluorescent lamps, LED fluorescent lamps have the following disadvantages: expensive, and there is still a big gap between the luminous efficiency that can be generally achieved and the theoretical luminous efficiency. There is still a certain amount of heat, and the light attenuation can be greatly reduced.
