I actually think I am going to try a 4000K med/hi CRI. I got a H600Fd MKIII(5000K) a while back and am actually finding it on the edge of too cool for outdoors(even my D25C Nichia 219b is pretty cool). I am finding that the warmer side of neutral looks/works better for an outdoor light and makes the the foliage look nicer and feels more warm and comforting. The question is if 4000K is too warm? As of now, I am finding 4300-4500K best but, have never tried warmer, yet... I might have to order the H600Fc MKIII too for backup/comparison.
The average household light bulb is soft white(2700K) and thats what makes most comfortable so, I often wonder why people want to go so cool with a flashlight.
One reason I leaned toward the H600Fc was that I have a BLF A6 in 5A tint, which by my measurements, is right at 4000-4100K on most modes, and if you ignore white wall hunting and putting it beside your best neutral white tints, it's quite pleasant in use. In my uses I look at a decent bit of colored wiring and it's very pleasant to use outdoors also, and the reds, oranges, greens, all pop nicely, and it's not high CRI.
The question is how close to 4000K will you actually get with your copy of the light? We know the "d" model is more like 4700K (a relief to me) on at least one model, and I think I've seen someone say their "c" is more like 3700K. Is that too warm? I don't know. I have a ToolVN in XP-L HI 4000K, and it measures 4400K and is very, very pleasant (could be my favorite tint of all my lights) with near zero tint shift, but it's definitely not 4000K. Moral of the story, it was a good bit off from nominal 4000K but on the good side (for me).
So for whatever reason, I went with the "d" model. Maybe the little bit of extra brightness got me, maybe I was afraid I'd get a "c" that's a little too warm. As long as there's not a bunch of green in the "d", I'll probably be cool with it.