Khoàⁿ-ū-kng
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Khoàⁿ-ū-kng (visible light) sī lâng ê ba̍k-chiu khoàⁿ ē tio̍h ê tiān-chû-pho, hoān-ûi bô chin bêng-khak, phó͘-thong-lâng khoàⁿ ē tio̍h pho-tn̂g 400 kaù 700 nm, ū-ê lâng ē-tàng khoàⁿ kah 380 kaù 780 nm. Sek-èng kng-soàⁿ liáu-aū, ba̍k-chiu tùi pho-tn̂g 555 nm ê le̍k-sek siōng bín-kám.