Were Adam and Eve covered in light and did they have precognitive power?
Light is a characteristic generally associated with God. For example, Jesus when transformed was described as "His face shone like the sun, and His clothes became as white as the light" (Matthew 17:2). This is because light represents righteousness and darkness sin. "God is light and in Him is no darkness at all" (I John 1:5). Moses, after being in the presence of God, had a face that glowed for many days thereafter. "Now it was so, when Moses came down from Mount Sinai (and the two tablets of the Testimony were in Moses' hand when he came down from the mountain), that Moses did not know that the skin of his face shone while he talked with Him. So when Aaron and all the children of Israel saw Moses, behold, the skin of his face shone, and they were afraid to come near him" (Exodus 34:29-30). Did God have the same effect on Adam and Eve as they walked in the Garden together? The Bible doesn't say. It would be pure speculation on any man's part to say one way or another.
Precognition is a fancy word for knowing the future. While mankind, through reasoning, can make educated guesses about the future, we have ample evidence that mankind is unable to do so with any accuracy. If nothing else can prove this point, take a look at our weather reports. Since we all descend from Adam and Eve (Genesis 3:20), we share common characteristics with them and all mankind. Jeremiah tells us, "It is not in man who walks to direct his own steps" (Jeremiah 10:23). Since we cannot tell what the future holds, we are unable to determine the direction we ought to take. Foreknowledge is a characteristic of Deity. This was one of the proofs God offered of His uniqueness. "Remember this, and show yourselves men; Recall to mind, O you transgressors. Remember the former things of old, for I am God, and there is no other; I am God, and there is none like Me, declaring the end from the beginning, and from ancient times things that are not yet done, saying, 'My counsel shall stand, and I will do all My pleasure'" (Isaiah 46:8-10). Only God can accurately tell the future in advance. Man and the figments of man's imagination (idols) are unable to accomplish this feat. Since this characteristic is not in mankind, we would not expect to find it in Adam and Eve.
The Bible gives no evidence that Adam and Eve knew the future in advance, beyond what was revealed to them by God. Actually, we could argue that quite the opposite was the case. One would hope that if Eve really knew the consequences of her sin that she would not have listened to the voice of Satan. Even though she knew in advance that eating the fruit would bring death into the world (Genesis 3:3), she accepted Satan's lie that she would not really die (Genesis 3:4) and ate of the fruit anyway. The end result was, "In the sweat of your face you shall eat bread till you return to the ground, for out of it you were taken; for dust you are, and to dust you shall return" (Genesis 3:19).