Depends on the total amount of light and on the solid angle covered.
All types of waves oby this law when they are emitted and allowed to travel freely away from the source with no focusing or other means of confinement.
Example for the typical behavior of the intensity according to the inverse square law.
Power / unit area [units cd = candles]
Intensity per unit area [units candles/m 2 ]
Examples:
A small globe and a large globe of 50 W have both the same intensity .
A small globe of 50 W and a large globe of 300 W can have the same luminance .
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