Man... I know its a pain in the ass but you really need to run a separate circuit for that light. The reason it just pulls 2.5 amps is bc its on a 240 plug. You have to get the right gauge of wire for the amount of voltage that will pass through the wire or it will get too hot and catch on fire. A 240 outlet would at the least need a 30 amp breaker and you would need 10/2 wire for that. Like i said i know its a pain but you really need to wire it right or you are gonia put yourself in danger. If you can change the cord to a 120v it would pull 5 amps and you could plug it in a regular outlet, which would be easier than running new circuits. Not to sound like a stick in the mud but you really shouldnt f with elelctricity...