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Artificial sunlight is the use of a light source to simulate sunlight where the unique characteristics of sunlight are needed, but where sufficient natural sunlight is not available or is not feasible. A light source used to simulate sunlight is a solar simulator. == Composition of natural sunlight == The spectrum of electromagnetic radiation striking the Earth's atmosphere is 100 to 1,000,000 nanometer (nm). This can be divided into five regions in increasing order of wavelengths: * Ultraviolet C or (UVC) range: 100-290 nm * Ultraviolet B or (UVB) range: 290-320 nm * Ultraviolet A or (UVA) range: 320-400 nm * Visible range or light: 400-700 nm * Infrared range. It is further divided into three types on the basis of wavelength: * * Infrared-A: 700-1400 nm * * Infrared-B: 1400-3000 nm * * Infrared-C: 3000-1000000 nm 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Artificial sunlight」の詳細全文を読む スポンサード リンク
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