Common sense and misunderstanding of LED lamp purchase

Consumers in the daily purchase of LED lights will encounter errors

In some lighting city to buy lights, there are some shopkeepers will tell consumers: "buy this lamp, this lamp has 3 LED, that only 1, buy 3 more bright" "3 LED" of course, than the 1 expensive."    But not really. Because of the different technologies adopted in LED chip, the luminous efficiency of the single chip is quite different. On the mainstream market, LED chips have many different forms, such as high power, medium power, small power, COB, etc.. For example, the middle power LED single lumen output at about 45lm, and high-power single lumen can reach more than 120lm, so it is very likely that the 1 LED luminous effect and 3 of the effect is the same. From the cost point of view, the high power chip prices compared to the high power, so not necessarily 3 LED must be more expensive than the 1. Mainly determined by the performance of the selected spare parts.

Most of the ordinary consumers in the selection of lights, or follow the oldest purchase of 40 light, 60 light incandescent method. The brighter the lights, the higher the wattage. Ask a simple question, a 7W LED, and a 8W LED. Which one do you think is brighter? The answer is: not necessarily.

In fact, the light and dark of light is measured by a professional parameter, which is called LM. It is the main standard to measure the light and dark of light. Compare the LED of 7W or 8W, and see their lumen output. Because LED's technology and incandescent lamp technology are different, the technology of incandescent lamp has been mature and stable after a hundred years of experience, while LED is constantly changing and can achieve different effects through different combinations.

So, it's also very likely that the lumen output of 7W is higher than 8W, so the 7W lights are actually more energy efficient than the 8W's..

Of course, as most consumers are unfamiliar with the terms LM, some manufacturers will also give labels on packaging that are similar to "40W incandescent replacement products" to help consumers buy and choose. For a simple example, an ordinary 40W incandescent lamp has an initial luminous efficiency of about 380lm and will gradually fade as the service life increases. LED is used as incandescent lamp substitutes, a measure of whether it can replace 40W incandescent lamp standard that is whether more than 350lm. Later, with the introduction of national standards, perhaps the LED bulb will be wrapped in lumens instead of watts.

Compared with the traditional energy-saving lamps and incandescent lamps, LED has many advantages, so LED lamps also have some shortcomings, in addition to the current high prices other shortcomings?

Everyone knows that the light emitted by LED is without calories. Therefore, there is no excess heat for the irradiated object and the indoor environment. But LED itself is extremely afraid of heat. The working temperature of the electronic component increases by 10 degrees, and the service life is reduced by half. Therefore, for LED manufacturers, how to control heat dissipation in a reasonable cost range is also a major difficulty for manufacturers to overcome.