Using these as a main light is not the safest idea since these are toys designed to be fun to use and not as tools for providing light in harsh conditions. As an additional light, why not, but the main headlamp should be reliable. Plus always carry a backup or two.
Maybe this one option is more than you asked for, but I’ll suggest it anyway.
My XTAR D06-1200 dive light has an XP-L2 V6 emitter that is doing 1200 lumens.
But it is more or less built like a mule.
Almost flat white colored “reflector”, and a convex lens in front. Just like a zoomie.
Result: an even white beam of app 90° wide and an unusual “throw”of about 50 meter.
It uses a magnetic slide that is not very well defined. More like rather abrupt.
But no menu, no blinkies. Very solid feel. Only two parts, head and body, 140mm long.
It is IPX8 rated for 100 meter. You either love it, or you’ll hate it.
For any discount Chinese light the reliability is questionable. I have had several lights with gremlins at the worst possible time. And some i have yet to explain.
If you need reliable then spend the money for a higher end brand.
And frankly you should double up, in the prepper world there is a saying, two is one and one is none.
Of course this gets very pricey and you have a weight constraint but don’t expect our fun discount lights to be life preservers.
Since you are going to carry more than one light at least try to have cross tolerant lights.
You don’t use a FET light when you go for a couple of hours underground.
For that you want a flashlight that can provide a stable output for a long time, behaves well on an almost empty cell (Zebralight beats everything in this matter), has a simple UI and is waterproof.
Well, my cat managed to kill a FW3A by throwing it from a table on a concrete floor from 1 meter. Whilst my AT Wizard headlamp once flew from three meters on a steel plate and was fine.
For a headlamp I would choose a Zabralight, Armytek of Skilhunt, and carry the FW3A, HL3A or whatever fet light as an additional high power fill light.
I have just had a look at the Nitecore HC65, and it has a beam of around 37.5°. So this headlight is also a definite possibility.
There are quite a few variations in the Convoy S2 series of lights I believe. However, there seems to be a substantial lack of technical information for these lights (no lumens, no candelas, no throws, no runtimes)! Without this information I can't make a determination as to whether the lights are suitable or not. So, these Convoy S2(+) lights are subsequently eliminated from consideration.
The explorations would be limited to a day trip, so no more than about 7 or 8 hours runtime at the very most (in "medium" level) would be required.