Abstract In museum lighting, paintings are the artworks with the highest light sensitivity. They are very vulnerable to irreversible permanent photochemical damage such as fading and discolouration. The basis of effective preventive conservation is to determine the two lighting quantity indexes of illumination and annual exposure. At present, there are some problems such as inconsistent standards, lack of accuracy, and failure to consider protection and visual needs comprehensively. In this study, halogen lamp was used as experimental light source, and 25 pigment specimens were irradiated for 1440 h at four illumination levels. The colour parameters were tested every 240 h and the colour difference was calculated. Based on the data analysis, three-dimensional visual curved surface plots of colour difference ΔE of 25 pigments varying with illuminance I and time t were established, which revealed the colour damage law of different pigments caused by illumination and time. Then, the curved surfaces were fitted into the colour damage evaluation equation set ΔE = fn (I, t) (where n = 1, 2, 3, …, 25) to establish the damage evaluation model of paintings, which described the damage law of pigments mathematically. Through the above model, the general recommended values of illumination and annual exposure for general painting lighting can be calculated, and the method for obtaining the special recommended values of illumination and annual exposure for precious paintings lighting was given.

中文翻译：

---

博物馆灯光绘画的灯光数量指标

摘要 在博物馆照明中，绘画是对光敏感度最高的艺术品。它们非常容易受到不可逆的永久性光化学损伤，例如褪色和变色。有效预防性养护的基础是确定照度和年暴露量两个光照量指标。目前存在标准不一致、准确性不够、没有综合考虑防护和视觉需求等问题。本研究采用卤素灯作为实验光源，25 个颜料样品在四个照度水平下照射 1440 小时。每 240 小时测试一次颜色参数并计算色差。根据数据分析，建立了25种颜料随照度I和时间t变化的色差ΔE的三维视觉曲面图，揭示了不同颜料因光照和时间引起的颜色损伤规律。然后将曲面拟合到颜色损伤评价方程组ΔE = fn (I, t) (其中n = 1, 2, 3, …, 25)中建立绘画损伤评价模型，描述损伤规律数学上的颜料。通过上述模型，可以计算出一般绘画照明的照度和年暴露量的一般推荐值，并给出了获得珍贵绘画照明的照度和年暴露量的特殊推荐值的方法。揭示了光照和时间对不同颜料的颜色破坏规律。然后将曲面拟合到颜色损伤评价方程组ΔE = fn (I, t) (其中n = 1, 2, 3, …, 25)中建立绘画损伤评价模型，描述损伤规律数学上的颜料。通过上述模型，可以计算出一般绘画照明的照度和年暴露量的一般推荐值，并给出了获得珍贵绘画照明的照度和年暴露量的特殊推荐值的方法。揭示了光照和时间对不同颜料的颜色破坏规律。然后将曲面拟合到颜色损伤评价方程组ΔE = fn (I, t) (其中n = 1, 2, 3, …, 25)中建立绘画损伤评价模型，描述损伤规律数学上的颜料。通过上述模型，可以计算出一般绘画照明的照度和年暴露量的一般推荐值，并给出了获得珍贵绘画照明的照度和年暴露量的特殊推荐值的方法。从数学上描述了颜料的损伤规律。通过上述模型，可以计算出一般绘画照明的照度和年暴露量的一般推荐值，并给出了获得珍贵绘画照明的照度和年暴露量的特殊推荐值的方法。从数学上描述了颜料的损伤规律。通过上述模型，可以计算出一般绘画照明的照度和年暴露量的一般推荐值，并给出了获得珍贵绘画照明的照度和年暴露量的特殊推荐值的方法。