The degree of light decay of LED lamps after 3 years of use depends on many factors, including lamp quality, usage time, heat dissipation design, and working environment. The following is an analysis under general circumstances:
1. Typical range of light decay
High-quality LED lamps (good heat dissipation, high-quality chips and driver power):
After 3 years of use, the light decay is usually within 5%~15% (assuming about 3-4 hours of use per day).
Ordinary LED lamps (medium quality):
The light decay may reach 15%~25%.
Low-quality LED lamps (poor heat dissipation, cheap materials):
The light decay may exceed 30%, or even higher.
2. Key influencing factors
Usage time:
The light decay is directly related to the cumulative number of hours of use. For example:
Use 3 hours per day → 3 years ≈ 3,285 hours → low light decay.
Use 8 hours per day → 3 years ≈ 8,760 hours → significantly increased light decay.
Heat dissipation design:
Temperature is the main cause of light decay. Lamps with poor heat dissipation will decay faster, and high temperature environments may double the decay rate.
Driving power supply stability:
Poor quality power supplies may cause current fluctuations and accelerate the aging of LED chips.
Chip and packaging technology:
High-quality LED chips (such as Cree, Nichia and other brands) usually have lower light decay rates.
3. Industry reference standards
L70 life (light output drops to 70% of the initial value):
High-end LED lamps: about 30,000~50,000 hours (calculated at 8 hours per day, about 10~17 years).
Ordinary lamps: about 15,000~25,000 hours (about 5~8 years).
Therefore, the light decay within 3 years will usually not exceed 30%.
4. Practical suggestions
Choose brand products: give priority to lamps with a nominal L70 life and good heat dissipation design.
Control the use environment: avoid high temperatures and confined spaces, and clean the lamps regularly to improve heat dissipation.
Reference product specifications: For specific light decay data, please refer to the "lumen maintenance rate curve" provided by the manufacturer (such as LM-80 test report).
Under normal use conditions (3-4 hours a day, suitable ambient temperature), the light decay after 3 years is usually between 10% and 25%, but low-quality products may be higher. If you need accurate data, you need to combine the technical parameters of the specific product and the evaluation of the usage scenario. you can buy low light decay led lamps , you can buy from http://www.benweilight.com
