CHW wrote: 當然唔同,磨平個頭可以變成散光,但光度減弱很多,通常用的LED直徑是5mm,散射角度與面積有限 這塊反光板是2吋x1.7吋,反射點直經有47mm,經膠片反射後光度只有減弱少許, 而且用2粒超光LED推,厚度只得3.4mm
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