How long can headlight remain on given charge of battery?

A 12 V automobile battery with negligible internal resistance can deliver a total charge of 190 A h. How long could this battery provide 170 W (total) to a pair of headlights?How long can headlight remain on given charge of battery?Well 170/12 gives you 14.2 amps so it would last around 13.4 hours in total :DHow long can headlight remain on given charge of battery?Halogen or incandescent?

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