Is the term used in the glazing industry to describe the energy spectrum radiated directly from the sun which passes through our atmosphere
and arrives at the Earth’s surface. It refers to Ultra-Violet, Visible and Near-Infrared radiation, each part of the energy spectrum referred to by
their waveband nomination. For the glazing industry it is specified as the energy waveband from 300 nm to 2,500 nm.
The intensity of solar energy at the earth’s surface is dependent upon the latitude of the building location and averaged environmental