Hi

>Yes, measure the resistance of the filament, now apply Ohms Law. Here once
>again we assume its a filament lamp were are talking about, cos if its an
>LED this don t work, and anyway an LED will only draw something in the order
>of 10 to 25 milliamps.
>
>Once you have the resistance of the lamp, divide the voltage the lamp will
>be running at by the resistance and you have the current.

Attention !!!
The resistence of hot filament is normally upper then cold filament
and the result could be not correct.
All filament lamps has a current peak on power up.
In most cases it is 10 times the average current.

Best regards

Roberto Marchini

Turin (Italy/Europe/Earth/Solar system/Milk way)