As a matter of fact, lens is the reason why the efficacy of LED is as high as 180lm/W. Matching with corresponding lens is benefit to greatly enhance the luminance of bulbs. Besides, the luminance range would endlessly enlarge within certain limits.
With the emergence of lens, LED light bulbs has not only made great progress in luminance, but also promoted the irradiation range and also cut down energy consumption in the surface. Lens gives full play to the reflection principle in physics. Reflection cup is made into cone shape. When LED gives out light, the slippy surface of cone would get the light source together, aiming to illuminate further distance.
As the development of economy and diversification of industry, the productive material of lens has changed, which has turned the initial glasses into silicon or PMMA, so as to generate the best LED flood lighting.
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