Light Transmittance within the visible spectrum

The light transmittance express the ability of the film to let the light pass through it. The total light transmittance is the ratio between the transmitted light and the intensity of the source. Therefore, films featuring a high transparency in the visible spectrum allows for the maximum energy to be transferred to the plans living within the greenhouse.

Diffused Light

The diffused light is a part of the radiation, which is scattered in random direction, rather than being transmitted through the film. Diffused light is very important within a greenhouse since it minimized the shadow zones and allows for a more uniform plant growth. The direct light is, instead, the part of the radiation which is transmitted through the film in the same direction of its source. The total transmittance is therefore the sum of these two contribution.

IR Barrier – The Greenhouse Effect

With the term IR Barrier we point out the optical film property which consists in the absorption of a special range of the spectrum, namely the one between 7 and 13 microns. In other words the film greenhouse effect consists in the film property to be transparent to the Visible and UV spectrum range, while absorbing a noticeable quantity of photons in the IR range. This results in higher greenhouse temperatures at night.