Solar Lighting Technologies for Highway Green Rest Areas in China: Energy Saving Economic and Environmental Evaluation

Table 1

The advantages of light guidance system.

Number	The advantages	The specific features
1	Energy saving	Only using natural light without electricity, the sealing system with good thermal insulation properties, classified as “cold light,” bringing no heat load effect to the room
2	Health	Natural light with no flash and no harm to human eyes, screening the majority of ultraviolet light by the UV surface of lighting device; only the small amount of ultraviolet light into the room could purify the indoor air, restraining the growth of microorganisms and improving the living environment
3	Good lighting effect	Natural light with a wavelength range of 380 nm~780 nm, color rendering of Ra 100, and the indoor diffusing light through diffuse reflector with gentle light and even illumination distribution
4	Long service life	The service life ≥25 years (the maximum service life of electric lighting is around 10 years)