Not something I've ever done but when we had the fox visiting regularly here, I started off with our household, 150watt halogen security light, as he always came in when it was dark. The colour cast was horrendous though.
This evolved into 2, 20 watt LED round bulkheads at 90 degrees to each other, although I only used the one mostly as switching the other on meant a foray to my workshop, which tended to spook the night life here. The colour was much nicer. I managed with the one as a 20 watt LED is probably in the region of 150 watt tungsten. Camera settings were everything in this light, I'd have to ramp up the ISO to get decent shutter speeds but even so, I rarely got above 1/100 sec if memory serves me right.
Similar to
THIS, although ours are white.
It did work although shutter speeds were slow but waiting for the moment when the fox was still and a steady hand on my part (lying prone most of the time) helped with movement issues. I have images that I would never have gotten using this set up. None of my images of the fox are award winners though and I only got pretty decent ones if there was still some natural light about, usually mid summer.
There are of course the set up that are purposed for this kind of thing, you mention the Rotolights but I've never used them, there may be other, cheaper brands out there. Have you considered continuous studio LED lighting? There may be something
HERE.
It's one of those things that I would pursue further myself if I had the notion to photograph wildlife at night. We have Tawnies here, I here them most nights in the woods across the river, I've seen and heard them overhead at night in the garden but never had them perch. Maybe I should try.
I think with the lighting you will need to do this properly though, you will get what you pay for but you may also be able to fangle something together for less.
I'm also not sure how the owls may react to new lights at first, it can be done and they will probably acclimatise over time.
I'm sure there will be somebody here who has more experience than I do of this but this is my take on it.
