I don't think it can but I want to be sure.
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I don't think it can but I want to be sure.
Level 6 AD has 1050 hit points.
Level 4 lightening has 390 attack. So, yes. 3 will destroy that AD.
Reference-
http://clashofclans.wikia.com/wiki/Air_Defense
http://clashofclans.wikia.com/wiki/Lightning_Spell
Assuming you are at early TH8 and trying mass dragons, I suggest you try 1 earth quake and 2 lightening. That also takes out AD and you can get 1 extra elixir spell say heal or rage for your dragons :)
You should always assume at least one bolt will miss, so 3 lvl 4 will be close.
Yes I've seen it done a million times as long as u don't miss with lights