Often the vis (backscatter) will preclude using a super bright light. I would look no further than the LX20+. I get over 4.5 hrs on medium, and 2.5 hrs on high. It's easy to swap batteries for a second dive if you have good enough vis to run on high the whole time.I do plan on doing limited penetration wreck diving
ETA: for flights, check the light in normal baggage with the other gear, the 4x (or 8x) 18650 batteries go in the bottom of my personal carry-on in a cheap plastic case.