Many powerful lights pulling alot of current in high/turbo modes will require an unprotected battery to both reach the higher outputs and most probably to fit in the light. If you are using the batteries in trustworthy well known brands that have low voltage protection, I wouldn’t worry too much about having a protected cell…

I can’t comment specifically on the Lumintop.

I do own a few protected cells, and I find majority of the time they don’t fit in the flashlight either due to length or width constrictions.