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LP PHOT 02 LP PHOT 02 probe measures illuminance ( lux) , defined as the ratio between the luminous flux ( lumen) passing through a surface and the surface area ( m2) . The spectral response curve of a photometric probe is similar to the human eye curve, known as standard photopic curve V( » ) . The difference in spectral response between LP PHOT 01 and the standard photopic curve V( » ) is calculated by means of the error f1’ . It has been designed for long-time outdoor installation. The photometric measurement probe designed for outdoor readings, is basically used for taking weather and climate measurements during daylight. Technical specifications: Typical sensitivity: 0, 5 ÷ 2, 0 mV/ klux Response time: