"So would increasing the voltage (with vcds) while upping the wattage (65 watt) reduce the amperage draw?"
No, it would increase it twice.
Increasing the voltage increases the current into a resistive load.
Increasing the rated wattage means it draws more current at the rated voltage.
So a 55w bulb draws 4.6A at 12V.
A 65W bulb draws 5.4A at 12V.
If you increase the voltage to 13V, it draws 5.85A (assuming R remains constant), and power increases to 13*5.85 = 76W.
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Last edited by Mark SF; June 16th, 2016 at 16:42.
