D. LED directirradiation without output cables required, reduce cable losses.
直接照射，不需要输出光缆，减少了光缆损耗。
2
At the same time should avoid sun long time direct floor, lest the film by ultraviolet light irradiation after long-term strong, premature cracking and aging.
同时应尽量避免太阳长时间直射地板，以免漆膜被紫外线长期强烈照射后，过早干裂和老化。
3
The model presented here only USES a digital elevation model (DEM) to compute direct solar radiation, time of irradiation and simply diffuse radiation.