Solar Light

Solar Light Company, Inc Model 540 Microtops II Sunphotometer Video

Solar Light’s Model 540 Microtops II® Sunphotometer is a compact, handheld 5-channel multispectral instrument designed to measure direct solar irradiance at all selected wavelengths. It then uses this information to provide atmospheric properties, such as aerosol optical thickness and water vapor column. Standard wavelengths to choose from are 340nm, 380nm, 440nm, 500nm, 675nm, 870nm, 936nm, and 1020nm. If your research is focused in the longer wavelengths, then we recommend the 675nm, 870nm, 936nm or 1020nm filters. If your research requires water vapor column measurements, then we recommend either the 936nm and 1020nm pair or the 870nm and 936nm pair. To increase the accuracy, all three channels can be used in the instrument at the same time: 870nm, 936nm and 1020nm filters. The unit features accuracy comparable to much larger and more expensive instruments, and we also offer a GPS receiver to facilitate field operation. If you prefer to research ozone only or ozone and water vapor column, please see our Microtops II® range of ozonometers.

Typical applications include: weather stations, scientific and educational studies, pollution monitoring, photobiology, environmental monitoring, vicarious calibration, and irradiance-based calibration of imaging sensors.

Solar Light Company, Inc. has been recognized worldwide for over 50 years as America's premier manufacturer of precision ultraviolet light sources, solar simulators, and radiometers. Our standard line of UV, visible, and IR radiometers and light meters measure laboratory, industrial, environmental, and health related light levels with NIST traceable accuracy. Column ozone, aerosol, and water vapor thickness measurements, in addition to long-term global ultraviolet radiation studies all over the world are performed using our atmospheric line of instrumentation. Solar Light also provides NIST traceable spectroradiometric analyses, calibrations for light meters and light sources, accelerated ultraviolet radiation degradation testing of materials, and OEM instrumentation and monitors. Please visit for more details, specifications, and pictures!

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