The NR-LITE is a high-output thermopile sensor which measures the algebraic sum of
incoming and outgoing all-wave radiation (i.e. both short-wave and long-wave
components). Incoming radiation consists of direct (beam) and diffuse solar radiation plus
long-wave irradiance from the sky. Outgoing radiation consists of reflected solar radiation
plus the terrestrial long-wave component.
The NR-LITE is equipped with Teflon-coated sensor surfaces. This results in a robust
design which gives very easy maintenance and good sensor stability. However, this design
is slightly less accurate than the more traditional radiometers which use plastic domes.