Pillar of fire by night
The pillar of fire by night remained with them until they reached the promised land. The pillar of fire was a symbol of divine guidance and was also God's way of supplying light for his people during the night.
The pillar of fire by night and cloud by day stayed with the Israelis from leaving of Egypt and arriving in the promised land the time covered about thirty eight years.
The pillar of fire produced enough light so they could travel by night. Traveling by night is cooler.
The pillar if light must have some unusual properties to enable over three million people and stock light to see were they were traveling at night.
Pillar of Fire by night
21 By day the LORD went ahead of them in a pillar of cloud to guide them on their way and by night in a pillar of fire to give them light, so that they could travel by day or night. 22 Neither the pillar of cloud by day nor the pillar of fire by night left its place in front of the people.