While I could be flippant and ridiculous and state, “Imalent R90TS and Imalent DX80” I’ll be serious here (in a fun thread of course 
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Of all the LED flashlights I have used over the course of my life, the only one that never failed (including the tailcap getting stuck to the point you can’t twist it open - SL PROTAC® EMS Aaargh!) ; bright enough ; good runtime ; consistent brightness; takes conventional AA alkaline or Energizer Ultimate Lithium batteries; etc.
Streamlight’s 4AA PROPOLYMER® LUX is the choice if I were to actually go into the Catacombs right now.
To put how good and useful the Streamlight’s 4AA Propolymer Luxeon flashlight is into context: I started with using the vintage Surefires. The E2D defender, E2O Outdoorsman, G2Z combatlight, A2 Aviator and so on. I would reach the bottom of a dark, scary, twisty, wooded night hike trail, and I would turn around and hike back the same way.
One day, when the aforementioned SL 4AA Propolymer Luxeon came out, it intrigued me with its 100 Lumens (I believe it was less, like 60 or 80 when it first came out) with 4 hours consistent brightness, not dropping below 80% and on 4 AA batteries. I bought it and hiked the same trail.
It was consistently brighter than any of my Surefires! To my surprise, I spotted an opening that took the trail upwards like a “V” from the previous path!
The 4AA Propolymer Luxeon allowed me to find an otherwise hidden continuation of the long, twisty, mountainous trail.
I have no doubt this is the flashlight I want as the baseline for my lighting when I go into the Paris Catacombs. After 15 years since its first release, it is still the perfect life preserving torch!