Johnson Window Films Dealer Resource Center

Solar Energy Distribution

It’s very important to understand the fundamentals of solar radiation so you can better describe the multiple effects of the sun as it reaches a window treated by window film.

Solar radiation is a term used to describe electromagnetic energy that travels from the sun, in the form of waves, to earth and is just one of several energy sources that make up what is commonly referred to as the Electromagnetic Spectrum (see Solar Energy). This spectrum includes energy types such as radio, microwave, infrared, visible light, ultraviolet, X-Ray and gamma ray emissions. All of these energy forms can be expressed in “wavelengths”
(note "W" in wavelength diagram to the right) and these waves are measured in nanometers (one billionth of a meter).

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For the window film business, the most important energy source to focus on in the electromagnetic spectrum is the Solar Spectrum. This spectrum is made up of 3 types of radiation:

This section will give you a more comprehensive overview of the Solar Spectrum and the causes and effects relating to glazing systems. We will look at 4 main areas of solar radiation:

1. Visible Light - the solar spectrum and how energy is displaced when sunlight strikes a window.
2. Heat Transfer - various ways that heat travels and how it is measured.
3. Solar Energy - light transmittance through a window and how it is measured.
4. Ultra Violet (UV) Light - different forms of UV rays and understanding its effects.

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