Survey: How many Joules should my power surge protector absorb to safely

protect my electronic equipment? I live in Florida. Lightning strikes here during Summer rains and thunderstorms. I'm a musician and a DJ so I should make a wise investment in one of these.

Florida, the lightning capital of the United States

I saw one for $6.99 at IKEA. It said 72KJ on the official UL label in the back.

I dunno if KJ means kilo-Joules = 1,000 Joules or I'm misunderstanding it.
 
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