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Old June 16th, 2016, 16:37   #58
Mark SF
Veteran Member
Join Date: Sep 2015
Location: SF Bay Area

"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.


Last edited by Mark SF; June 16th, 2016 at 16:42.
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