We usually measure brightness in Watts. 1 watt
is one Joule per one second.
So for example, at your home you can look at
the light bulb in one of the lamps and it may be
for example 100 watts or 100 W.
On this same scale, the brightness of the Sun
is 1,00,000,000,000,000,000,000,000,000 Watts.
So, if you can go to the store and buy
1,000,000,000,000,000,000,000,000 light bulbs of
the kind you have at home ( 100 w bulbs) and you
turn each one on, then your lamp will be as bright
as the Sun.
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