Every living thing in our world is dependent upon the sun, with out it nothing would live or grow. Sunlight increases the capacity of the blood to carry oxygen to the body tissue. It helps with the obsorbency of vitamin D. Sunlight can also destroy harmful bacteria, there are many many more benefits for health, using the sunlight.
Genesis (1 : 16-17). And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also. And God set them in the firmament of the heaven to give light upon the earth. Ecclesiastes (11 : 7). Truly the light is sweet, and a pleasant thing it is for the eyes to behold the sun. Malachi (4 : 2). But unto you that fear my name shall the sun of righteousness arise with Healing in his wings; and ye shall go forth, and grow up as calve of the stall.
Sunlight is one of Gods healing medicine, for all to have freely.
As God intended