I. Introduction
At present, LED bulbs have two important problems in the market:
The first is that the logo is unclear. According to the LED bulbs tested by the ITRI, more than 50% of the LED bulbs have an actual luminous flux of less than 10% above the indicated value.
The second is the uneven quality. There is currently no set of specifications on the market that can clarify the relationship between the price and quality of LED bulbs. As consumers often hold "apples and oranges" in comparison, some even spend a higher price, but they do not buy relatively high quality products. This kind of bad money is getting worse and worse. It has caused the European, American and Japanese countries to pay close attention to the identification and quality of LED lamps/light bulbs.
In view of this, the Energy Bureau of the Ministry of Economic Affairs has also accelerated the promotion of energy-saving stamps for LED bulbs. For this matter, the author is a joy and a worry. The good news is that at least Taiwan has a common standard that can provide consumers with the LED bulbs they need. Worrying, consumers have spent a lot of money and bought LED bulbs that meet the "Energy-Saving Standards Requirements" project. Is there really a guarantee of quality?
Second, the lumen maintenance rate is enough to represent the life of LED lamps?
The more officially representative specifications on the market, which can be related to the life of the bulb, should be the LM-80 specification issued by the US Environmental Protection Agency/Energy Star for LED bulbs/lamps. However, since the release of this specification, there have been some different sounds in North America, and some reliability experts have even begun to call for the immediate stop of the LM-80 lumen maintenance (L70) as the life of LED bulbs or lamps. The only basis for this.
In fact, in 2006, the US Department of Energy's Solid State Lighting (SSL) Quality Working Group invited 32 reliability experts to discuss the reliability and life estimation methods of LEDs in depth. After considering the industrial technology capabilities of LED at that time, the working group decided that the reliability of LED components and lamps with lumen maintenance (L70) would be the most significant and the most easily quantifiable. The reason is that the traditional tungsten filament bulb is used, as long as the tungsten filament is burned, it means that the bulb has reached the end of its life, and the LED bulb is gradually and slowly in the lumen recession. In the early stage of the recession, people are not visually aware. It is always necessary to wait until the light source decays to 70% (L70) of the original light source, and people will feel the light bulb darkening, which will affect the illumination. Therefore, the working group recommended the lumen maintenance rate (L70) as the sole basis for the LM-80 specification. But the controversy is that the lumen maintenance rate is not equal to the life of the LED bulb or lamp (Life Time)? What are the problems with the LM-80 specification?
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