Yes, there would be an issue if you were cruising along a back road at 0 to 10 mph, with gun in hand. I don't think the DNR would consider it 'Deer Shinning', ("Spotlighting"), when you're cruising along at 50 to 70 mph on a main road. If they did you would beat the charge in court plus, I'm sure you would get a chuckle out of the judge.
Actually, though a lot of bicycle riders use head/helmet mounted lights all the time, I know of no such devices that are currently DOT approved for that type of use in or on motor vehicles while they are operating on a public motorway.
Most of us out here that use auxillary lighting not approved by the DOT for road illumination or signaling while operating a motor vehicle on a public motorway are in violation of state and federal law.
In addition, most of us who have changed out or modified our exhaust system on our MC or car from the orginal equipment that was designed and DOT approved for that particular vehicle are in violation of state and federal law.
If such unapproved added lighting is wired up so it is on when the vehicle and/or original lighting is operating and it does not have it's own on/off switch, the state inspection station is technically supposed to fail the vehicle for inspection.
The same is true for exhaust modification.
It is, however, one of those sets of laws that's usually overlooked by LEOs and the state inspection systems (except for removing cat converters).
My aftermarket Jardine rumblers are so loud that I have to wear earplugs with my 3/4 (and even my full-face modular) so I don't damage my hearing when I crank the beast past 55mph.
But I'm heard when not seen.
My aux 325-lumen (non-DOT) LED bullets are aimed downward enough to not shine their full punch into oncoming traffic.
Not only am I able see more, but I'm seen sooner.
In many areas, any "decorative" LED lighting on a motor vehicle is illegal. In most areas, using certain colors of illumination on a vehicle is illegal.
In almost all areas using "decorative" light systems that cycle through on/off or color changes is illegal.
That being said, if you do make it to court for something extremely over line like wearing a 200 lumen light on your head while operating a MOTOR vehicle on a public motorway, DO NOT expect a judge to be yuckin' it up with you.