I guess the question is whether the wiring to the plug as the same or better wattage rating as the 36w light bar. Maybe look at schematic or generally look at wattage ratings for 12v plugs?
I was wondering how many watts are really needed for tractor use. Seems like the first post was about a 72w light bar. Given the dramatic improvement in lighting some folks have posted using LED bars generally, I'm wondering if a 36W bar is plenty enough light on a tractor?
The other question that comes to mind is that one of these light bars might make for a nice work light. Now if you can plug the thing into the 12v plug without any issues.....hmmm, consider the possibilities. I've got a situation where it would be nice to run a work light off a 12v battery, but I need good light and need it to run for 3 or 4 hours at a time.