Question 1

What is IEC 62717 and IEC62722?

Accepted Answer

IEC62717 is the performance standard of LED modules, and IEC62722 is the performance standard of LED lamps. They are all standard documents for LED solutions, mainly including marking, size, power, luminous flux, correlated color temperature and color rendering index, lifetime, etc. The IEC62717 standard covers a lot of test methods, and many test methods of the IEC62722 quote from IEC62717, because they are only different in the test objects.

Question 2

What is the difference between LM 80 and TM 21?

Accepted Answer

TM-21 provides guidelines for using data collected by LM-80 testing to evaluate light source lifetimes in excess of the LM-80 recommended test period, TM-21 allows us to extrapolate lifetimes up to 6 times the number of test hours. Therefore, we can understand that the test methods and data is provided by LM80, and TM21 tells you how to apply these data to get the lifetime of LEDs which you want to know. For details, please refer to the official website of Energy star.

Question 3

Do LEDs really last 50000 hours and how it’s calculated?

Accepted Answer

The theoretical average lifespan of LEDs is usually up to 50,000 hours, which is based on LM80, IEC62717 and IEC62722 reports. In the actual test, we rarely found that the failure of the LED chips or the switching power supply which caused abrupt light output degradation. We can get L70>50000hrs or more through lumen maintenance calculation. So we think LED can really last 50000hrs or more. This is much longer than the lifetime of traditional incandescent lamps, traditional halogen lamps, and traditional energy-saving lamps. L70>50000 hours LED can be used for more than 17 years if used for 8 hours a day.

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Light output of LED solution and its degradation – 62717 and LM80

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LED Street Light

Solar Street Light

Led Flood Light

Solar Flood Light

LED High Bay Light

High Mast Light

LED Traffic Light

LED Tunnel Light

LED Garden Light

LED Canopy Light

Led Bollard Light

Lighting Accessories

Smart Systems

Simulation Design

Smart Financing