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Ánh sáng nhân tạo và ánh sáng tự nhiên
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Tham khảo tài liệu 'ánh sáng nhân tạo và ánh sáng tự nhiên', kỹ thuật - công nghệ, kiến trúc - xây dựng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | LIGHTING LAMPS AND FITTINGS radiation physics quantity lighting technology quantity and symbol lighting technology unit and abbreviation radiation flux luminous flux lumen Im radiant intensity light intensity I candela cd irradiance illuminance E lux lx radiance lighting density L cd m2 radiant energy quantity of light Q Im h irradiation light exposure H lx h 1J Quantities relating to radiation physics and lighting technology o o o o o power supply rail with lamps supply tube track system supply track with light fitting installation assembly pendant light fitting round cylindrical wall floodlight directed beam round cylindrical installation assembly pendant light fitting square installation assembly pendant light fitting rectangular light fitting general X2 X light fitting number of bulbs 60 w power light with switch Y safety light in battery circuit safety light in standby circuit spotlight 36 w 2 X 58 w fluorescent lamps general socket in strip arrangement power socket number of lamps power light fitting for discharge lamp general Significant lighting parameters The radiated power of light as perceived by the eyes is measured in terms of the luminous flux 0. The luminous flux radiated per solid angle in a defined direction is referred to as the light intensity I. The intensity of a light source in all directions of radiation is given by the light intensity distribution generally represented as a light intensity distribution curve see following page . The light intensity distribution curve characterises the radiation of a light source as being narrow medium or wide and as symmetrical or asymmetrical. The luminous flux per unit area is the lighting intensity or illuminance E. Typical values global radiation clear sky max. 100000 lx global radiation cloudy sky max. 20000 lx optimum sight 2000 lx minimum in the workplace 200 lx lighting orientation 20 lx street lighting 10 lx moonlight 0.2 lx The lighting density L is a measure of the perceived brightness. For lamps