Thinking about your application, I kept arriving at something like this. You've gotta set it up all the way down there but it might turn out simpler than building a super high-performance gun-mounted light!
Good luck with the conversion! Please keep us posted on your thoughts and results.
Those foxes are beautiful; the ones we get in Texas are hard-bitten indeed! Those look like they've been eating...a bit TOO well.
We've never honestly found baiting to work too well. We, my buddy & I, prefer to get to know the foxes habits. For example, I go to a new area, so naturally I know nothing about it, scout it out during the day if possible to get the lay of the land. What we then have to figure out is, where do the foxes come from, what direction, what times, where are they going to, and why? That's found by spending time on the ground, and it's information that'll project years into the future onto other foxes not yet born, because it'll be to do with feeding grounds, lay up sites, and dens, and fox paths or "highways". With all that information then I can set about thinking where is a good spot to sit out and wait, that I have a good field of view, that I am between where my foxes are coming from and where they want to go. It's very valuable information that way.
There's nothing especially high performance from the lights, I just have expectations. Those are that I can shoot accurately and safely out to 300 yards on a good night, so my light must keep up with my requirements. This is pretty normal stuff over this side of the Atlantic really. The technology is moving on now from high draw incandescent bulbs to lower draw light sources like LED and HID. But, it's still all evolving so there are teething issues at the moment. Tonight I shot a fox at 180 yards using the Crelant 7g5cs with collimator head and neutral tint (I removed the pointless window pane at the front of the collimator head). Then I shot a second fox at 210 yards later with a Nightmaster 800 (dereelight). I know how my bullet drops, and when there's little or no wind I can shoot a fox out to 300 yards, so I expect my light to keep up with me. The Lightforce Striker with the 100W bulb could do that, but the price is a heavy 28amp lead acid battery on my back, that's just masochistic given the newer technologies available to us now.
So the HID, yeah, I am excited about this. Personally I see it as another stepping stone, rather than my destination. If it works as expected I'll still need a battery in a backpack. Though I can either use a smaller amp, and therefore lighter, lead acid, or I can go Li-ion (don't really want to due to expense and seeing pics of them after exploding).
Since I am so happy with the Thrunite TN31 as my search light, I am eagerly awaiting an LED torch that can do what I need it to do. Then I can be wire and large battery free. Operate with torches that use the same batteries and same chargers, that simplifies my life.
And yes, foxes are magnificent creatures, I just wish they were vegetarians and didn't eat my lambs come Spring time. I could get a lot more sleep that way, lol.
Those are my thoughts in a nutshell tonight.