We are delving into an area where sciences meet theology and thus can easily escalate this post high into the nose-bleed section of intellectualism. I shall employ every precaution at my disposal to keep from being confusing as well as leave my aptitude and ability to speak on this subject. *Grin*
Light is invaluable to us both as human beings and photographers. Our bodies require a certain amount of light to continue necessary functions, one of our primary functions being vision.