Kommentar zu Schemuel II 22:13

From the brightness before Him. You should not conclude that He dwells in darkness¹⁴I.e., because the previous verse mentioned darkness in connection with God. Furthermore, the verse here is describing punishment meted out to Yisroel’s enemies. The verse is telling us that the punishment’s source is light. but rather it is light that is within the boundary and it is from that light that is before Him that the burning coals of fire [came forth]. [It is from there] that the arrows were shot at Mitzrayim.