Papa is pure light, there is no darkness in Him at all. The descriptions of Him in the Word are wrapped in the brilliant light of Glory. Even where He wrapped in dark clouds it is to shield the children of Israel from His full presence as it would be too much for their rebellion to withstand.
His glory is presented as blinding light and overwhelming power mixed with love beyond comprehension.
Darkness is almost always related to the attempt of men and angels to hide from His presence. To avoid the brilliance of His glorious light. However it is always a futile pursuit. Attempting to build our own little kingdom separate from Him is futile. Though we might try to go to the ends of the earth to “get away”, there is nowhere in creation where Papa is not already present, in fact, He’s been there since before it even existed in this realm.
Light is energy at its purest form, scientific study has associated it with specific frequencies of energy much like sound or radio and everything is held to gather with frequencies. It was all spoken into existence or according to scientists exploded in a Big Bang of pure energy. Taken down to the components of the atomic building blocks of matter we see that very energy and see there’s no real explanation of why those particles move the way they do. To men they seem “self animated”, but the Word says they are sustained by His breath the same way everything was created.
So dwelling in the light as He is in the light is as simple as abiding in His truth and resting in His presence. Chase the light of His Glory, actively pursue His face, hold fast to the hand of salvation that Jesus extended to us all rescuing us from the darkness of our own foolish hearts.