I live and die by flashlights due to my work, they are "required" to be intrinsically safe with either UL or MSHA ratings for Class 1 Div 2 minimum. Now, 90% of the time I am working under a hot work permit and confined space entry permit with a 4 gas monitor connected to my person somewhere, which all means I don't give two shits about if my lights are intrinsically safe unless I'm working in an IDLH atmosphere.
With that said, my daily use light is a Fenix w/ rechargable 18650 cells.
My backup is a Streamlight Microstream 1x AAA cell.
Main work light is a Pelican Kinglite 4000 8x D cells.
In my pelican work case I have two UK4AA lights, and 2 Pelican Sabrelite 2000 LED's.
In the pickup I have a Princeton Tec League II and a Princeton Tec Torrent LED.
For a pen light, it is really hard to beat any of the AAA cell Streamlights for how cheap they are. I consider them a consumable item and throw them in the trash regularly, or hand them off to other employees that are cheaper about them than I am.