Testing new video lights in Hanko with H2O

Testing my first video dive lights in Strand Varisniemi, Hanko, Finland with H20 dive club. Filming with a Gopro 13. Jukka was training sidemount and I just wanted to test lights. He learned that his cylinders become overly buoyant already around 130 bar and he needs to move them forward and I learned that my dive light batteries last about 51 minutes on full power in the current temperature.