T8 led lamps no longer need ballasts. The T8 brackets are all empty. It can be lighted up by connecting to 220v city power, which is indeed much more convenient. Why do you no longer need a ballast? It depends on how it works.
Reasons why old-fashioned fluorescent tubes need ballasts.
1. For inductive ballasts. The traditional fluorescent tube is lighted by fluorescent powder, and both ends are filaments, which need to be applied with high voltage to light up. So I thought of using the principle of inductance back-EMF superposition to increase the voltage. The instantaneous voltage generation depends on the instantaneous starting voltage of the starter. When the two work together, the lamp can be lit. The disadvantage is that the supply voltage cannot be too low. When it is lower than 160v, it basically doesn't work. For power-deficient areas, it is not easy to use. The tube does not light up at all.
2. The emergence of electronic ballasts is to solve the problem of low-voltage start-up difficulties. Make the ballast electronic. Utilize the principle of switching circuit. In the case of low pressure. Increase the output voltage to light up the fluorescent tube. There are requirements for the MOS tube that generates high voltage, because it is often subjected to high voltage, and it is easy for the triode to break down. The disadvantage is that the service life of electronic parts will be shortened. Do not switch frequently.
The reason why led lamp does not need ballast.
1. The light-emitting principle is different.
The LED tube is a semiconductor chip that emits light, and there are many LED lamp beads that are connected in series and parallel to form a luminous body. The number of lamp beads in series determines the voltage of the lamp string. Our Technology is generally between 12 strings to 24 strings. The isolated power supply adopts low string, and the non-isolated power supply adopts high string count.
We can see. In fact, the working voltage of LED lamp beads is not high. 12 strings of lamp beads use a voltage of about 36v, and a voltage of 24 strings is only around 24*3v=74v, which is actually relatively safe.
2. The working principle of the power supply, the led power supply is a switching power supply, which is controlled by a dedicated chip. When the input voltage is low, the output terminal will feed back the signal to the input terminal to increase the voltage; when the input voltage is high, the output terminal will also feed back a signal to the input terminal to suppress the voltage. Thus. The voltage at the output end is stable, and the current is constant, which protects the safety of the led lamp beads. It can work stably.
Advantages of led tube.
1. Overcome the shortcomings of inductive ballasts. Can not start under low pressure. The led lamp has a wide voltage range. 85-265v input voltage can be started, the use range is wider. It can be used almost all over the world.
2. Overcome the shortcomings of electronic ballasts. It is easy to cause damage to the power supply. The voltage output from the LED lamp power supply of Langte Lighting to the LED lamp string will not exceed 80v, which is almost in a low voltage state. The electronic components on the power supply are also protected, and the LED lamp beads are also protected. In this situation. Of course, the life of the led tube is much longer than that of the fluorescent tube with a ballast. The benefits are very obvious.
Analyze through the above principles. You should know the reason why LED tubes don't need ballasts. As for how old-fashioned fluorescent tubes can be converted into LED tubes, of course it is a matter of course. All the ballasts in the T5, T8, and T10 lamp tube brackets are no longer needed. The neutral wire and the live wire of the power supply directly enter the lamp holder. Install the led tube and you're done. The principle of T5 led tube and T10 led tube is the same as T8.
