The vanilla VR implementation in Subnautica is very old and kind of tacked onto the game as an afterthought. You have to play with a regular controller and I found the menus to be in the most eye-strain spot possible.
I know there is at least one VR mod to fix it and bring in motion controls but I’ve never tried it.
IMALENT MS18, about $650 usd. company is in china so probably. only does this much light for a couple seconds though and gets wacky hot real quick. and there’s some camera antics going on. it is bright as fuck though