(general question) headlamps for critical applications like caving

Hey all,

please excuse the many topics I opened right after starting to use this site the day before yesterday, but I have so many questions I want to ask this community. one of them:

Now it might have been that I only imagined this, but some petzl headlamps, if I remember correctly, used to do this: burn on high beam to about the top 90% of the batteries charge in a couple hours, then switch to moonlight for the rest of the charge automatically, still being able to shine for a long time at the reduced brightness, saving the user of the light from the prospect of pitch darkness at the expense of a few minutes more runtime on high. Do any of the enthusiasts’ light you talk about here do this? petzl was never exactly one of the manufacturers who cater for the flashaholic, with their somewhat pricey but still plastic construction, no effort in effective heat dissipation therefore low boost brightness, etc. etc. But I suppose it was never their focus either. I have a couple of very old lights from them from the halogen era of things, but nothing more recent than 15 years old because I fell out of the sport early. But those lights you could supposedly depend on. I mean we always carried extra, just in case.

Do these lights (manker, olight, astrolux, nitecore, lumintop, trustfire, acebeam, etc.) do this kind of “safe” behaviour of discharge?

Yes, most modern lights do this.

What they will do is warn the user through a light flash or a large downgrade in brightness to warn the use that the battery pack is almost empty.