I would never put Lanza Del Rampagio on a country or island level scale (Not even mountain.)
High City Level+ would be the appropriate label because for one:
It dwarfed Los Noches (Basically an entire city)
It didn't create any serious after-effects like an earthquake or devastating crater/blow, in fact, the force of the blast itself didn't cause any of the lesser characters on the sidelines like Uryuu to fly or be pushed away (The distance wasn't so far either.)
It's only been used once, also the fact that H2 Ichigo casually crushed it with his bear hands.
It's no joke I'll tell you that, Ulquiorra is capable of spamming the blast as many times as he wants (which goes to say he's no pushover and especially isn't going down so easily as everyone's making it look.)
Barragan is only a threat to the other two admirals, I highly doubt he could age Light, and even by then, Kizaru's attacks are too fast.
I also must state that: Kizaru attacks take time to charge, and physically he isn't light speed, his attacks are, and he's capable of turning himself into light.