Té-pho hok-siā (shortwave radiation) sī kí Ji̍t-thaû hòng-sàng--chhut-lâi ê 1 chióng hok-siā lêng-liōng (radiant energy), pho-tn̂g liōng-iok-á sī 0.2 kaù 2 µm. Tī kng-phó͘ (optical spectrum) lāi-té, khoàⁿ-ū-kng (visible spectrum) kap lím chí-goā-soàⁿ (ultraviolet) ê kng-soàⁿ lóng chún-sǹg.

Té-pho hok-siā sī siong-tùi tn̂g-pho hok-siā (longwave radiation) lâi kóng--ê.

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