Do led lamps need a ballast? unneeded reason
Ballasts are no longer required for T8led lamps. The T8 brackets are all empty. Connecting to the 220v mains power can light up the work, which is indeed a lot more convenient. Why are ballasts no longer needed? It also depends on how it works.
1. Reasons why old-fashioned fluorescent tubes need ballasts
1. For inductive ballasts. Traditional fluorescent tubes rely on fluorescent powder to emit light, and there are filaments at both ends, which require high voltage to light up. So I thought of using the principle of inductive back EMF superposition to increase the voltage. The instantaneous voltage is generated, and it 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. Below 160v, it basically doesn't work. It is not very useful for areas without electricity. No light bulbs at all.
2. The emergence of electronic ballasts is to solve the problem of low-voltage startup difficulties. Electronic ballast. Using the principle of switching circuit. under low pressure. Increase the output voltage to light the fluorescent tube. The requirements are put forward 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 life of the electronic parts will be shortened. Can't switch frequently.
2. The reason why LED lamps do not need ballasts
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 in parallel to form a luminous body. The number of strings connected in series determines the string voltage. Our Langte technology generally ranges from 12 to 24 strings. Isolated power supplies use low strings, and non-isolated power supplies use high string counts.
We can see that. In fact, the working voltage of LED lamp beads is not high. 12 strings of lamp beads use a voltage of about 36v, and only 24 strings of voltage, about 24*3v=74v, which are 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 a 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 terminal is stable, and the current is constant, which protects the safety of the LED lamp bead. make it work stably.
Third, the advantages of led lamps
1. Overcome the shortcomings of inductive ballasts. Low pressure will not start. LED lamps have a wide voltage range. 85-265v input voltage can be started, and the use range is wider. Available 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 light tube power supply of Langte Lighting to the LED light 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 led lamps is much longer than that of fluorescent lamps with ballasts. The benefits are very obvious.
Fourth, through the above principle analysis. You should know the reason why LED lamps do not need ballasts. As for how to convert old fluorescent lamps into LED lamps, of course, it is a matter of course. All the ballasts in the T5, T8, T10 lamp brackets are not needed. The power neutral wire goes directly into the lamp socket. Install the LED light tube and you're done. The principle of T5led tube and T10led tube is the same as T8.
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