via：https://www.greentechmedia.com/articles/read/sustainable-led-reusable-materials

The rise of LED lightbulbs has been driven in large part by their environmental credentials, and rightly so. LEDs consume a fraction of the power used by traditional incandescent bulbs and have exceptional longevity, lasting up to 25,000 hours.
Most of an LED’s environmental impact (around 98 percent) is incurred during its use. Factors such as longevity and efficiency present the greatest opportunity for LED manufacturers to improve the environmental impact of their products. After that, the biggest influencing factor -- the "greenness" of the power source itself -- is out of manufacturers’ hands.
However, while only constituting around 2 percent of the overall environmental impact of an LED’s lifecycle, the manufacturing and recycling phases are becoming increasingly important considerations for LED manufacturers. The trend is being driven in part by corporate social responsibility and marketing, but there are also more pragmatic reasons to consider the whole lifecycle of LEDs -- the most obvious is in cost savings through using recycled material.


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