On day four He made the Sun. Well, you probably turn on your light so you can find your toys or schoolbooks. It comes from electricity. You do not need the Sun to shine in your room all the time, because you have electricity that produces light. In fact, we get light from many places other than the Sun.
Lightning bugs make light, and so do some fish and creatures in the ocean.
In Heaven it will be daylight forever, but there won't be a Sun because God and Jesus will light up everything. So we can't say exactly what kind of light was there on Day One. All we know is that God has always been able to create light without the Sun. Inc. All rights reserved.