通光，读音tōng guāng，汉语词语，意思为有光线通过；即通光殿。
简单的估计，是让通光直径是光斑的2倍或以上。
Simple estimate is to pass the light spot diameter is 2 times or more.
该镜架对通光孔的遮挡最小，结构简单，成本低廉。
The mirror holder shields the light through hole least. Theholder is constructed simple and cost low.
“通光”牌电子线缆获“中国电子行业知名品牌”。
"Tongguang" brand electric wires and cables are honored as "Well-known Brand" by China electronics industry.
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