SM700 is a portable Lux meter designed to perform light measurements from the bottom of an aquarium. The probe is fully submersible. It is supplied with a light sensor connected to the meter that measures from 0 to 5000 Lux.
The average indoor lighting ranges from 100 to 1000 Lux and average outdoor sun lights about 50,000 Lux. Lux is a unit that indicates the density of light that falls on a surface.
The human eye is sensitive only to blue, green, and red light, so in calculating the Lux falling on an object, only the light that the human eye sees is counted. When only infrared light falls on an object, the Lux is counted as zero since our eyes see nothing. Mathematically, a spectral weighting function becomes convolved with the actual illumination spectrum to calculate Lux exactly. This is the formal definition of Lux, and it makes Lux an unusual unit to measure. This unit is only one of a kind.
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