Design for an equipment measuring the "photon number equivalent to maximum wavelength".

为了评估光作为环境因素对生物体的影响，有必要考虑环境光的光谱分量与感光器官的吸收或作用光谱之间的关系。评价指标的数量应少，可能的话只有一个。在这项研究中，我们建议使用一个指数来表征环境光。其原理是：1）在300 nm至1,100 nm范围内测量各波长的能量; 2）将各波长的能量转换成光子数; 3）用相对吸收光谱对光子数进行加权，并将加权后的光子数进行积分，此值称为“最大波长等效光子数”。我们设计并制作了一台测量光能和计算这一指数的设备。并通过不同的实验对指标的有效性进行了检验。结果表明，该指数用于表征环境光的有效性。

To assess the effect of light on living organisms as an environmental factor, it is necessary to consider the relation between spectral component of the environmental light and absorption or action spectrum of the photoreceptive organ. The number of the indices for evaluation should be small, only one if possible. In this study we propose to use an index to characterize the environmental light. The principle is as follows.1) The energy of each wavelength is measured from 300nm to 1,100nm.2) The energy for each wavelength is converted into photon number.3) The numbers of photon are weighed by relative absorption spectrum and all these weighed numbers are integrated.This value is called "photon number equivalent to maxijmum wavelength". We designed and made an equipment to measure the energy of light and to calculate this index. Then the validity of the index was tested by different experiment. The result indicate the usefulness of the index for characterizing the environmental light.