Looking for a light (again)

Hi all, I’ve been out of the loop for a while and I’m once again looking for a new light. I will be using it in caves for long exposure (long, but sub 1 minutes) photography paired with my Acebeam X45 II. The reason why I want another is because one light is not useful to create shadows and this makes photographs lack depth, although light painting can alleviate this problem somewhat but is sometimes useless due to the size of cave passages (think bigger than football pitches etc).

So the last light I was looking at were the Lumintop GT3 and Manker MK34 II, now I understand there is alot more to consider.

If I include some requirements, I would be greatful for any recommendations.

Output (lumens): circa 18k (similar to my X45)

Waterproofing: IPX8 (or equivalent due to my lights having to go under water briefly but occasionally)

Cell configuration: unprotected 18650s or 21700s, no built in battery.

Charging: external or on board (if waterproofing can be maintained)

CRI: Not inportant as I edit my images

Emitters: XHP series to keep similar tint to my Acebeam X45.

Budget isn’t important but of course less is better.

Hope that isn’t too much, but the enthusiasts here I’m sure will help due to their knowledge.

Thank you