Does "the God of the Majus" mean that they believe light is God?

The meaning of 'Ilah' (God/Deity) is that which hearts worship with love, hope, fear, and glorification. Thus, whoever worships something, glorifies it, and believes that it benefits or harms, that thing is a god to them. Accordingly, those who worship light or darkness, or good and evil, are affirming thehood and believing in the divinity of what they worship.