Cabal
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Wow! i didn't know that.
Solar variation - Wikipedia, the free encyclopedia
The average amount of solar power per square meter on Earth is about 1.13 watts, if you focus a bit of that down to a spot, it'll get hot.
A lightbulb by comparison has only about 60W power to begin with and then rapidly spreads out and more than likely just loses its power warming the surrounding air.
And incidentally, this is similar to why lasers can be fairly dangerous, they have a high operating power and usually the beam spot size is very small.
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