LED lighting know how much

With regard to LED lighting, it is still a relatively new thing for most consumers to accept her and choosing her needs a process. Before the introduction, it needs to be explained that the LED lamps described in the following are all products with higher power and higher brightness, rather than the traditional LED status indication products.

First, from the category of LED lights, the main types are: 1. Bulb lamp (similar to the bulb used by the family); 2. Fluorescent tube; 3. Flashlight 4. Table lamp; 5. Decorative lights; 6. Spotlights; 7. Downlights; 8. Track lights; 9. Street lamp; 10. Lawn lights; 11. Underwater lights, etc., from the type of power supply, there are high-voltage power supply, battery low-voltage power supply, electronic transformer low-voltage power supply, from the function, there are non-dimming, SCR dimming, linear dimming, PWM dimming, And intelligent dimming (only the Secretary for exclusive patented technology) and so on. For home-use LED lighting fixtures, the type is mainly 1-5, while the 5-11 category is mainly commercial and more commonly used in public places. The use of other categories is less common and is not mentioned here.

Second, let's talk about some of the detailed specifications of the LED. The number of watts a lamp uses is very clear. It is also very clear that the introduction of Taobao or other manufacturers also pays attention to this description, and we buy the same power level. After the product, you will find a difference between light and dark. As to why this phenomenon occurs, I would like to make some descriptions here. I hope that you will not be confused or confused when purchasing LED lamps. LED light is different from the traditional incandescent and energy-saving lamps, LED lights to distinguish between different colors, which is professionally called color temperature (that is, the color of light), the vast majority of domestic manufacturers are generally called warm white, positive White, cold white, so called, is very unscientific for LED lights. Strictly speaking, it should use specific numbers to describe this specification. For example, 2700K, 3000K, 4200K, 5000K, 6500K, the lower the color temperature, the lower the color. Yellow, reddish, the higher the more white, blue, in general, the lower the color temperature, the smaller the deviation, the greater the contrary, such as the 2700K color temperature point, required within +/-500K, and 6500K is required to +/-1000K can be. With the same power level, the higher the color temperature, the brighter and more dazzling the human eye feels. Therefore, the color temperature to be selected depends on the location of use. Such as the bedroom, baby room, etc. The recommended color temperature is lower, so it does not feel dazzling, very soft and warm, and the living room you need to choose a higher color temperature (although personally recommend that you choose the best to 5000K, 6500K may feel very bright , but because of the blue light will make people dazzling, a long time feels more difficult to accept). After the color temperature is finished, the color rendering property that has a lot to do with light, that is, CRI, is closer to 1 as much as possible, indicating that the closer it is to the sunlight, the better we are to avoid color casts when looking at a colored object. , Wearing red clothes, into the space with blue lighting, the clothes look no longer blue. Therefore, color rendering is very important for the luminaires, especially for students who are at home, so be sure to pay attention. In general, the lower the color temperature, the higher the color rendering, according to the current LED technology, the poor is about 0.7, better to achieve 0.8 or more, even 0.9 is also, of course, this parameter is generally the user is usually There is no easy way to test, you can take a color you are particularly familiar with and then turn on the LED light to see if there is a big change in color. The above are all related to the optical parameters in the several large-scale systems of LED luminaires. To this end, we still have to say that the parameter that we care about most is the brightness (usually measured by the luminous flux of professional use). This parameter is directly The response is sensory brightness. For comparison, a 40W incandescent bulb has a luminous flux of about 470lm (lumens) and 60W of about 800lm. For the brightness levels commonly used in these two homes, the LED emits a luminous flux power consumption of about 7W and about 10W respectively (color temperature is different have difference). From the loss of power, we must see that LED lights can save you RMB for a year. Then it also said that the important optical specifications --- light decline, when we use incandescent lamps, energy-saving lamps, fluorescent tubes and other lamps, we must have found that the lamp is darkened after use for some time, this is the light decline. For LED, this parameter is more important. A normal LED lamp must ensure that the luminous flux still has 70% or more after two years. Otherwise, the quality of the LED must have problems in the sub-system work. For this, there is usually no way to directly test, so here you can only tell you, buy LED please buy boutique, buy brands, do not buy only know how to install the cottage people "production" of the product. There is no way for the user to make such a choice. Who called our country to be a cottage with too many brothers, too bad, too "professional", they can sacrifice users to make money, then the user can only abandon it.

Third, the optics will temporarily say these, can not say for a moment, the following should talk about the electrical problems in the LED drive system. When talking about optics, the power is mentioned above. For the power marked on the luminaire, it usually refers to the input power, which is the electricity bill you have to pay for. Power consumption is a big concern for users, but you do not know what is hidden behind this specification. Incandescent light, you buy back according to the power printed on the lamp, there is no suspense, but the LED light constant current drive is the core of the entire lamp, her conversion efficiency also determines how much you want to consume more electricity for no reason. For example, if one driver's power conversion efficiency is 85% and the other is 75%, then the other one consumes 10% of your power, and the loss is enough. Remember to remember this parameter! Since electrical parameters are mentioned, let's say a few more. Besides the conversion efficiency of the driver, there is a more serious problem. The output ripple current of the driver. This parameter is generally not marked on the product, but it can As a result, the loss of the LED increases, which in turn causes the LED to generate heat. Then the life of the lamp is shortened, which is serious enough.

Suddenly speaking of the service life, the design of electronic subsystems is excluded. The selection of electronic components is of the utmost importance. However, if you want to distinguish between pros and cons, you can't help yourself! It is only recommended that you go to buy quality products, buy brands, and buy trustworthy products. We can see colorful wherever we do not experience blows and rain. Ha ha…. . By the way, the power factor of the LED lamp, that is, the PF value, the closer the value to 1 is, the better is the parameter related to the reactive power loss. You will not pay for this parameter and secretly tell you this. It's the power plant that has been lost, er,... but then, for the sake of future generations, we can waste less resources and pay no attention to it, so our products consistently respond to the government's call.