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Yes 101-160 WHr is technically possible with written airline approval. I have never tried that so I cant comment on how easy it is to do. My gut tells me it would be a pain in the butt to get in hand and you would probably have to do it each time you traveled.
@stuartv in cave water you can definitely grab the light head no problem, but you can feel the heat coming off of it. Any of the big boy lights you'll feel the heat on the lens as well.
No idea about their driver mechanism on which one is right. I didn't have it in the water long enough to find out, was only about 2 hours and you can't see the brightness dropoff during that duration.
When @The Chairman and I were diving in Olsen at Peacock Springs a couple weeks ago I did all of my dives on a Cave Adventurers backup light and he was diving my LX20. They are both more than bright enough with the backup light being comparable to a 10w HID that was the standard for a long time and the LX20 being about 50% brighter. I didn't even have mine on full power the whole time. Do I enjoy my LD35 on high? Absolutely! If I'm on the trigger, in big cave, or just am in the mood for a lot of light, nothing I have dove beats it and I usually have a pair of Cave Adventurers video backup lights on my helmet. These dives didn't require that much light since we were going into some smaller passages, kicking very slowly, and was in familiar cave. Diving with small lights vs big lights changes the whole experience of the cave and it's nice to dive with small lights sometimes. The key with the big boy lights is the ability to kick them down when there is too much particulate in the water and the backscatter gets bad.
Do you still own and dive the EX35? If yes, what has your experience been over the past year? I just ordered one.