Almost all crops like diffuse light. The scattering glass on the top of the glass greenhouse increases the total photosynthesis through better light transmission and reduction of heat stress.

In recent years, technicians have conducted extensive experiments to evaluate the benefits of diffuse (scattered) light. Initially, it involved trials to prove whether or not the added value was achieved for each crop. Subsequently, the researchers evaluated why diffused light would lead to higher yields and better quality. Recently, research goals have been more about fine-tuning.

Based on the experiment, the researchers concluded that almost all crops benefit from scattered light. Generally speaking, the higher the scattering, the better (the higher the haze or F scattering value). For each crop, it is necessary to consider whether the profit is greater than the loss of light in a certain period of time. Modern diffused glass has almost no light loss. Diffuse reflection coating allows almost no loss of any light from right angles. Any oblique light will only be reduced by a few percent. In spring and summer, the gains are definitely greater than such small losses.

Research proves our understanding of the benefits of diffuse light. The light is better distributed both horizontally and vertically. It is worth noting that the improved horizontal light distribution is even more important than the improved vertical distribution, and in the early years, deeper light transmission was one of the main arguments. Under the diffuse greenhouse roof, because the light is evenly distributed, there are no light spots or hard shadows. Better horizontal distribution prevents individual plants or leaves from having to constantly adapt to different light conditions. These adjustments are difficult for plants. The photosynthesis system may take up to 15 minutes to adapt to the new light conditions, and during this time it may change again.

It is also important to distribute the light vertically. Under the action of diffuse glass, the top leaves receive a little less light, and the middle leaves receive a little more light. Both aspects are beneficial to us: the heat stress of the plant head is avoided, and the middle leaves are more actively involved in photosynthesis. There are multiple stages of thermal stress. First, the plant will start to evaporate more as the leaf temperature rises. This means that growers must ventilate to control humidity. In the process of continuous overheating, free radicals are formed. These molecules will spontaneously react with everything around, thereby destroying everything in the cell, including the photosynthetic system. A particular concern is photoinhibition. If the plant receives too much light, it will suspend the photosynthesis system to provide protection. This will not cause damage-but there is a limitation. After a period of time, the combination of high light levels and increasing leaf temperature can lead to the formation of free radicals. This is why the use of diffuser glass is strongly recommended in hot climates.

Through better horizontal and vertical light distribution, under the diffuse coating, the crop will change. More leaves will become active, increasing their photosynthetic capacity. The number of leaves in the greenhouse has also increased. Taken together, all these aspects lead to better growth and production. The yield increase of each crop is different, but reaches 5% to 10%.