I own the Romisen.
Remember it only has ONE mode, HIGH.
Batteries will run about 1:45 - 2 hours.
Its not a lightweight, but will do the job.

I would feel safer with 2 of them and fishblock mount.
NOTE: This light my become too heavy if mounted to your helmet.

Maybe, the dinnotte may better serve your needs when they go on sale again for $100.

Good Luck

ROb