Why LED bulb standard 7W and the measured value is only 6.5W?

Introduction: LED lighting products from the beginning of 2011, the influx of a large number of channels, sales gradually sink to the county, town, village, is now widely accepted and accepted by the public. However, for the use and understanding of LED lighting products, there are still some errors.

Not long ago, a campaign to explore the "LED era, you are still pursuing power? "This topic, I think at that time, this kind of problem does not need to discuss at all, the person that all lighting knows. But a few days ago a partner of more than 10 years to work with the dealer's phone woke me up, he asked me, why do we have a LED bulb 7W power and the measured value is only 6.5W?

Traditional lamps are the subject of the time to take the nominal power difference, why is the existence of LED products under the nominal power of the difference?

I explained:

First, the power difference is within the nominal range of gb;

Second, consumers spend money to buy is the light, we are now pursuing the luminous flux, rather than power consumption.

Later, I learned that he called, because some small factory salesman with a power meter to go there to promote their products, we can see that the market competition is more intense. However, they use such a promotion or because their products are low light effect, in fact, this measure of the quality of the lamp itself is not the index.

LED era, different manufacturers use different chips, different forms of packaging can achieve a completely different light effect, different drives will make the product has different conversion efficiency.

LED lighting efficiency is mainly determined by the following three factors:

First, the luminous efficiency of the LED chip;

Two, the drive conversion efficiency;

Three, the light transmittance of the glass cover /PC cover.

These three points are an important factor in determining the final lighting efficiency. According to the law of conservation of energy, the higher the conversion efficiency of electric energy to light energy, the smaller the energy consumption of the same luminous flux, the more energy saving. A variety of marketing techniques to businesses caused confusion, but we must be clear that consumers spend money to buy light, rather than power; the same power lamp to make higher luminous flux, consumers are the ultimate beneficiaries.

Since the relevant national standards have not yet been developed, so in the period of rapid development of the industry, there is a certain confusion is difficult to avoid. However, the future of the country to develop standards, whether it should weaken the power index and strengthen the luminous flux index? Only in this way can we ensure the rights and interests of consumers, and guide the right direction of consumption.