作用光谱是描述不同波长能量在产生生物响应中相对效力的参数。生物响应有涉及分子水平的,诸如对DNA的损害;也有涉及整个生物组织水平的,如种植的作物。至于红斑作用光谱,它是基于皮肤被紫外辐射的各种波长照晒后,产生发红现象的一种主观度量。它取决于很多变化着的因素,诸如, The spectrum of action is a parameter that describes the relative potency of different wavelength energies in generating a biological response. Biological responses involve molecular damage, such as damage to DNA; there are also crops, such as planted, that involve the entire biological tissue level. As for the erythema action spectrum, it is a subjective measure of reddening based on the skin’s various wavelengths of UV radiation. It depends on many changing factors, such as,