Energy is constantly being improved. But today they are already being pressed by a new technology - LED (Light Emitting Diode) or light-emitting diodes.
More and more countries are introducing such a product. This, as well as ignorance of the technology itself, leads to the emergence of some myths about LEDs.
Collected here are the most popular misconceptions about this technology. People have to decide for themselves whether LEDs are suitable for them and in what cases their use is justified.
LEDs have a short lifespan. LEDs are said to burn out quickly. Meanwhile, the service life is determined by only one criterion - the quality of production. The lamp requires that the LED is produced from a good crystal, a properly sized housing or heat sink, and a quality power supply.
LEDs are composed of many elements, but the most important is the crystal. It is grown from several dozen very thin layers with semiconductors. The quality of the crystal also determines the lifespan of the LED itself. If the basis is low-quality materials, then the device will quickly burn out. Renowned manufacturers guarantee the high quality of their products and their durability. It is also important to calculate the parameters of the lamp housing. It is necessary to select its mass, surface area, material. This will determine the cooling of the diode. If we neglect the parameters of the case, the LED will not cool well and even a high-quality crystal will not provide a long service life. The power supply is also important to keep the LEDs from flickering. In combination of all three of these parameters, a durable light source is born. If at least one of them is of poor quality, then the LED may stop working earlier than planned. Ideally, the device can work up to 50 thousand hours, that is, 11 years in 12 hours a day. But such indicators can be demonstrated, of course, only by the highest quality products. To get a really good and durable device, do not hesitate to ask for the brand of LEDs, CE certifications, Energy Star and LM-80 compliance. The seller should share this information, it is worth inquiring about the warranty and post-warranty service. Do not forget about such an important criterion as price and quality. A cheap product immediately arouses suspicion, since substandard components were probably used in its manufacture.
LEDs have dim light. Modern LED devices are in no way inferior to conventional lamps or fixtures. Much depends on the expected light intensity. So that reality does not disagree with desires, the operation of a lamp with LEDs can be checked using a luxmeter. This fixture is usually available from any lighting dealer. This will measure the true illumination. Understanding exactly how many "suites" are required, it will be easier to choose the right lighting. A numerical rating is much better than the subjective “much light” or “little light”. Usually, 50-300 suites are enough in the interior, but 300-1000 suites are required for a workplace.
LEDs are harmful to the eyes. It is worth moving from subjective opinion to scientific opinion. If we consider the spectrum of light emitted by an LED, it turns out that it emits only in the visible range. There is no harmful ultraviolet and infrared radiation here, so there can be no question of any harm to vision from such a source.
LEDs emit a bluish color. This is a very popular misconception about LEDs. In fact, like small fluorescent lamps, they can emit both warm and cold white colors. You just need to choose the desired shade. And LED lamps can produce other colors - red, blue, orange, green. When choosing such a source, you need to pay attention to the color temperature. Warm white light ranges from 2200 to 3000 Kelvin. Neutral white is 3000-4500 Kelvin and cool white is 4500-6000 Kelvin. When purchasing a lamp, it is worth looking at what color temperature it gives. Warm white light has a yellowish tint. It makes it easier to create a cozy and relaxing environment. But neutral white light is more suitable for office spaces. A bluish tint is present in cold white, but its advantage is in accurate color reproduction and hue. Such LEDs are used in advertising signs and other places where it is important to accurately reproduce the colors of objects.
LED bulbs have poor quality light. This myth states that LEDs distort colors and tints. There is an important characteristic that allows you to determine whether this is so or not - the color rendering index. The closer it is to 100, the more natural colors are obtained, close to natural, as if the sun is shining. Modern standards require that in offices and domestic premises there is lighting with a color rendering index of more than 80. If, however, LED luminaires with a color rendering index less than 70 are used, the illuminated objects will look faded.
For better lighting, you need to make the angle of the light wider. When choosing lighting, it is worth considering how the light will be scattered so that it does not blind those in the room. A narrow downward angle of 5 to 30 degrees will create small and highly illuminated spaces. This kind of lighting is great for directional beams. We can talk about niches, columns, plants. But with a wide angle of 100-160 degrees, the lamps will strongly scatter the rays. But they will dazzle, visible from anywhere in the room. Such lighting is suitable for a large and spacious room. In everyday life, it is better to use some intermediate option of 40-90 degrees. So the light will be diffused in the right way, perfect for general room lighting.
LEDs are only needed for accent lighting. LEDs can be used in a variety of applications, including accent lighting. It should be understood that such specialized lamps are not suitable for general lighting, the opposite is also true. To create accent lighting, low power LEDs, from 0.01 to 0.2 watts, are suitable. They give a narrow angle and do an excellent job with this type of lighting. Conventional LED luminaires use more powerful LEDs (1-5 watts). The efficiency of the light source is indicated by the indicator - more than 100 lumens per watt of electricity consumed. For incandescent lamps, this parameter is only 10-15 lumens per watt.
All Chinese LED products are of poor quality. This myth applies in general to all the numerous Chinese products. But among them there are both outright cheap and high-quality goods. It all depends on the price. In the same factory, a manufacturer may offer multiple prices for the same product. You just have to pay for high quality. Here people are still ready to buy cheap, turning a blind eye to the characteristics. This is how the myth is born that only bad products are produced in China. But in this country, not only its own products are created, but also large orders from other states are carried out. The high quality product itself can be developed in any developed country. And in China, after careful selection, it is produced by a company that guarantees the required characteristics. A quality product appears on the market. Even German and American companies manufacture their products in China. Pay attention not to where the lamp is made, but to how it is made. The criteria have already been mentioned above.
You can get cancer from LED lights. This myth comes from people who don't even try to look at things from a scientific point of view. Neither LEDs, housings, nor power supplies contain mercury, lead, or other harmful substances that cause cancer. And since they are not there, then the disease has nowhere to come from. Also, LEDs do not work in the harmful UV range. Light is emitted only in the visible range. There is no negative effect on the skin or vision. High-quality products in the field of lighting technology, the same power sources, do not emit electromagnetic interference detected by special devices. But such failures could affect other electronic devices. Actually, this is what extends the life of the myth. It seems that if electronics are exposed, then a person has something to fear.
LEDs harm a person's biological clock. The human body is capable of responding to light. This is called a biological clock. Communication is carried out by the hormone melatonin. It is produced in our body during sleep. Melatonin affects concentration, performance, alertness. An increase in the level of such a hormone in the body makes a person sleepy, calm, and interferes with concentration. Blue is the best way to slow down the production of melatonin. That is why in the evening or at night it is not recommended to use light with a large blue component, cold white. It is better for the body to calm down in the evening. In the evening, it is good to use warm white light, with a low temperature of 2700-3500K. But during the day it is better to use cold white light with a temperature of 4000-6000K. It blocks the synthesis of melatonin and stimulates activity, prevents sleep in the workplace. But fluorescent and fluorescent lamps also have a blue component. But LED lamps can change their color temperature and adjust the blue level. When choosing lighting, it is worth considering in which room it will be used. In offices, cold white light will show itself better; vigorous activity is needed there. But at home, when you just want to relax, warm white lighting will show itself well.
Flickering LEDs tire the eyes. It is not LEDs that flicker at all, but fluorescent lamps. LED lamps will flicker only in the case of a poor-quality power source. The selection of quality components can eliminate flicker problems. By its nature, it cannot be, since LEDs need constant current.