Two types of greenhouse glass horticultural float glass and diffuse glass
In vegetable production, a rule of thumb states that 1% more light equals 1% more potential production. The greenhouse covering therefore should allow the sunlight to enter the greenhouse as much as possible for a maximum potential photosynthesis. Just like every constructive element in the greenhouse, glass is evaluated carefully for its light translucency and its return on investment, if not more.
Two types of greenhouse glass can be distinguished; horticultural float glass and diffuse glass. The typical glass that is used for glass greenhouses is the horticultural float glass. It is a transparent glass with a high light admittance to ensure sufficient light in the greenhouse. The other type of glass is on the rise and installed in many new greenhouse projects. Diffuse glass has an etching or a structure which changes the properties of the surface of the glass, which can be benefitial for the crops within the greenhouse.
The iron contents of greenhouse glass also have impact on the overall light translucency. The so-called “low-iron” glass is more transparent than regular glass. Another way of allowing more light pass through the glass, is by applying AR-coatings. These permanent anti-reflection coatings reduce the reflection levels of sunlight on the glass, which results in more light in the greenhouse.
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