This is the sort of thing where I, as a meteorologist ne physicist, have to rein in my reality. If you're going to put in the real sound effects of lightning, then you're implying the real thermal effects, and more. If someone unleashes a lightning bolt in a 10' corridor, they're going to superheat the air and anyone in the corridor for some time to come is going to suffer serious burns. Lightning also kills more people by indirect voltage difference, than direct strike. Theoretically, everyone within about 10' or maybe even 100' of the target will be at risk of heart-stopping currents running through their bodies. Anyone in metal footwear is at higher risk.
Bottom line for me, the spell isn't powerful enough to drag these real-physics consequences with it. If you choose to include them, be ready for players to actually use them to their advantage. "Hmm, I can deafen all the orcs with one bolt..." or "If I target the knight in full plate, he's got the worst RR but I can also affect everyone else around him." And "If the wizard we're chasing threw that lightning bolt, we would've heard and seen it across the prairie, and could've figured where he was."
Yes, the sound and heat and surrounding damage are physically real. But Magic. And Balance.