为了高精度地测定作用谱，需要改进实验方法。这涉及到辐射源以及皮肤反应的定量测量。我们使用可调的、高度单色的辐射源和皮肤反应的仪器测量，重新评估了人类红斑和色素沉着的作用光谱。辐照系统由准分子激光泵浦的染料激光器和紫外光纤系统组成。用CIELUV系统的色度计测定照射后的皮肤颜色。应用激光可以获得很高的光谱分辨率。例如，紫外线下红斑作用光谱的最大值- 在298,5 nm处测量B范围，在紫外线-A区域的362 nm处发现额外的最大值。我们的结果表明在330nm处存在光化学机制边界。将红斑和色素沉着曲线与使用常规辐照源（灯和单色仪）测定的文献光谱、CIE的当前标准红斑曲线以及其他光生物作用光谱进行比较；特别是UV-A中的紫外线损伤和肿瘤诱导光谱。研究报告以英文撰写，并附有法文和德文的简短摘要。它由14页组成，有3个数字和1个表格。

In order to determine action spectra with high accuracy, improved experimental methods are needed. This concerns the irradiation sources as well as quantitative measurements of the skin reactions. We reevaluated action spectra for erythema and pigmentation in humans with a tunable, highly monochromatic irradiation source and with an instrumental measurement of skin reactions. The irradiation system consisted of an excimer laser pumped dye laser and an ultraviolet fiber optic system. The skin colour after irradiation was determined with a colorimeter using the CIELUV system. By applying laser a very high spectral resolution in action spectra could be obtained. For example, the maximum of the erythema action spectrum in the ultraviolet-B range was measured at 298,5 nm and an additional maximum was found at 362 nm in the ultraviolet-A region. Our results suggest a photochemical mechanism boundary at 330 nm. The erythema and pigmentation curves are compared with spectra from the literature determined with conventional irradiation sources (lamps and monochromators), with the current standard erythema curve of the CIE, as well as with other photobiological action spectra; especially with spectra for UV damage and tumor induction in the UV-A.The research note is written in English, with a short summary in French and German. It consists of 14 pages with 3 figures and 1 table.