How many BTU's of cooling per light?

I read somewhere a few days ago that 3500 btu per 1000 watt light. but then i just googled 'air conditioner btu per 1000w light'

www.weedguru.com • View topic - Growroom Cooling

This is long but basically says anywhere from 3500-5000 btu per 1000 watt and other factors(ballasts/outside temperature/insulation)

So if you live somewhere hot, plan 4500-5000, if you live somewhere cool, 3500-4500.
 
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