市面上的发光字质量参差不齐，运用寿数短的只需1年半载，时间长的可以运用3-5年，如何来判别发光字的质量呢？先要从光源来知道下发光字，不同标准的LED 有着不同的发光视点和不同的亮度。那么，如何给不同的产品选择合适的LED,使其既能发挥大成效，又能下降成本呢？
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