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why does light increase or decrease

86What happens to the brightness of light emitted by a
lightbulb when the current in the filament increases
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1 Answer

Hi Richard;
As you may already know, joules is a unit of work.
As either the voltage and/or level of current increases, so too does the wattage.  Henceforth, the brightness, amount of work, performed by the light proportionately increases.