With the continuous development of technology in life, LED fluorescent lamps have become one of the earliest LED lamps to enter the room. Because there are many points compared with fluorescent lamps, there are many LED products, and the market is quite hot, which is very popular among consumers. Today we come together to see the difference between fluorescent lights and led lights, I hope to help everyone.
We often come into contact with the concept of fluorescent lights and LED lights. But do you really understand the difference between these lights? Today we will come together to see what is the difference between fluorescent and led lights.
Fluorescent lamps, also known as fluorescent lamps, work on the principle that a fluorescent tube is simply a closed gas discharge tube. The main gas in the tube is argon gas (including 氖neon or 氪krypton) and the gas pressure is about 0.3% of the atmosphere. Also contains a few drops of mercury - forming a trace of mercury vapor. Mercury atoms account for about a thousandth of all gas atoms. The fluorescent tube is a mercury atom that is lit by the lamp, and the ultraviolet light is emitted by the process of gas discharge (the main wavelength is 2537 angstroms = 2537 × 10-10 m). About 60% of the energy consumed can be converted to ultraviolet light. Other energy is converted to heat. The fluorescent lamp emits visible light by absorbing ultraviolet light from the fluorescent material on the inner surface of the tube. Different phosphors emit different visible light. Generally, the efficiency of converting ultraviolet light into visible light is about 40%. Therefore, the efficiency of the fluorescent lamp is about 60% x 40% = 24% - about twice that of the same power tungsten filament lamp.
Light Emitting Diode, also known as a light-emitting diode, is a solid-state semiconductor device that converts electricity directly into light. The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a holder, one end is the negative pole, and the other end is connected to the positive pole of the power supply, so that the entire wafer is encapsulated by epoxy resin. The semiconductor wafer consists of three parts, one part is a P-type semiconductor, in which the hole dominates, and the other end is an N-type semiconductor, where it is mainly electron, and the middle is usually a quantum well of 1 to 5 cycles. When a current is applied to the wafer through a wire, electrons and holes are pushed into the vector sub-well. In the quantum well, the electrons recombine with the holes, and then the energy is emitted in the form of photons. This is the principle of LED illumination.
1. High luminous efficiency: The luminous efficiency of fluorescent lamps is about 55-80 lm/W (the luminous efficiency of Philips T8 fluorescent lamps is 72lm/W), while the luminous efficiency of LEDs is above 100 lm/W. Recently, Cree's XLampXP- G's luminous efficiency has reached 130 lumens / W, and will continue to improve in the future. The difference between the two is now nearly doubled. In the future, it is possible to reach more than three times.
2. High efficiency of the luminaire: The efficiency of the luminaire mainly refers to the effective luminous effect, because the fluorescent lamp is 360-degree illuminating, and the light emitted in the opposite direction is of no use. Therefore, fluorescent lamps usually use a white lampshade to reflect a considerable portion of the reverse light. In general, fluorescent lamps have an efficiency of only about 70%. The LED fluorescent lamp is 120 degrees, so all the light is effective light. Although sometimes the 120 degree illumination angle is narrower, it is still sufficient in most cases. And this angle of illumination can also be adjusted as needed. As mentioned earlier, the luminous efficiency of Philips' T8 fluorescent lamp is 72lm/W, and the 36W fluorescent lamp emits 2592 lumens, but the luminous efficiency is only 70%, so the effective lumens are 1814.4 lumens, and the luminous efficiency of LED has exceeded 130lm/W. Assuming 100 lm/W, as long as 18W, it can reach 1800 lumens, that is, as long as half the power of the fluorescent lamp can have the same brightness. Moreover, the luminous efficiency of LEDs is increasing year by year.
3. Power efficiency is high Because all lamps except the incandescent lamp need to have a special power supply, the efficiency of the power supply affects the efficiency of the entire lamp. Take Philips' 36WT8 fluorescent lamp as an example. Its rated output power is 36W, but due to the access of the magnetic ballast, the measured input power is 42.4W, that is, the core inductance loss is 6.4W, the efficiency is reduced to 85%, most domestic iron core inductor power consumption Above 10W, the power factor is below 0.512. The power efficiency of LEDs is usually as high as 90%, and an 18W LED fluorescent lamp requires only 20W of input power. The power factor can also reach 0.9 or more. It saves more than half of the electricity compared to fluorescent lamps, which means that an 18-watt LED fluorescent lamp can replace a 36-watt fluorescent lamp.
4. Long life: A carefully designed LED fluorescent lamp can last up to 50,000 hours. The life of a fluorescent lamp is usually only 5,000 hours (some domestic fluorescent lamps have a lifetime of only 300 hours). The difference between the two is nearly 10 times. The best long-life fluorescent lamps are also only 10,000 hours, and the difference between the two is also five times.