If you do not include the EM radiation caused by inductive coupling of the filament with its environment (which is fairly small) then it is just a hair under 2%. Bear in mind this is radiative flux, so it doesn't account for the sensitivity of the eye to certain wavelengths.
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@Demosthenes
If you do not include the EM radiation caused by inductive coupling of the filament with its environment (which is fairly small) then it is just a hair under 2%. Bear in mind this is radiative flux, so it doesn't account for the sensitivity of the eye to certain wavelengths.
@Science