Greenhouse lighting design [3] Sunlight is essential for photosynthesis green energy, is also a major source of Greenhouse. Therefore, the design Greenhouse, the first to solve the problem of good lighting greenhouses, maximize the light transmission to the greenhouse. [3] Greenhouse northern China mainly in winter, spring and autumn use. Winter sun angle is low, sunrise in the southeast, southwest sunset. Therefore, in order to maximize the use of sunlight in the winter greenhouse multi-use block south, east-west orientation of the extension. [3] proved that winter morning, the outside temperature is very low. After the east in the morning kick greenhouse straws, indoor temperature is often significantly decreased. Greenhouse orientation to the west as well as possible, this will help to extend the afternoon and night time lighting insulation. 5 degrees west are appropriate, should not exceed 10 degrees. [3] When the light incident angle increases from 0 degrees to 40 degrees of light transmittance of the transparent material has little effect on the amount of reflection loss of light only a few percent;. When the incidence angle within 40 degrees to 60 degrees light transmittance with increasing angle of incidence was significantly declined; when the incident angle greater than 60 degrees, the transmittance showed a sharp decline. Therefore, the incident angle of 40 degrees or 50 degrees of projection angles is the critical point of impact of the size of the light transmittance of a transparent material. Greenhouse in the early development of the winter solstice, the sun put on greenhouse lighting surface projection angle reaches the maximum angle of 50 degrees set lighting reasonable lighting roof angle.