How do Christians reconcile the differing attributions of light source in Rev 22:5 (God) and Rev 21:23 (Lamb/Jesus Christ)?

Revelation 22:5 New International Version > There will be no more night. They will not need the light of a **lamp** or the light of the sun, for the Lord God will give them light. And they will reign for ever and ever. Revelation 21:23 New International Version > The city does not need the sun or the moon to shine on it, for the glory of God gives it light, and the Lamb is its **lamp**. How can one reconcile the description in Revelation 22:5, stating that God illuminates the celestial city, with the description in Revelation 21:23, where it is said that the Lamb (referring to Jesus Christ) is the lamp of the city? Both passages attribute the source of light to different entities (God and the Lamb), and how are these representations reconciled within Christian theology?