Well I just went out and gave the Hartenberger Nanos a try as video lights. I am new to video and this was a very rough 1st trial. These are brand new so the bulbs have not burned in and the batteries where full but have yet to be drained down and recharged.
Setup
Canon Elura 90
Ikelite Housing
Inon UAL 100 Wide Angle Lens
2xHartenberger Nanos each on 8" arms
Conditions
Viz Approx 20’
Green Water
Overcast
The Nanos have four power settings. To turn on you move a small lever on the back to the + symbol and they come on at the lowest level. Move the lever to the + you go up one more power setting. Early in the dive one thing that was a bit confusing was when I put them on their highest Level (4) a couple of seconds later the 4 indicator lights showed 3. I thought this meant the light was on power level 3. After a few minutes I realized this was indicating battery power. If you push the lever again it showed 4 lit indicator lights.
Burn time turned out to be about 50minutes. This was with power at full about 25-30minutes of the dive and a lot of changing power up and down throughout the dive.
I ran a couple of “testsâ€. I would pick a target, sit at a set distance and then shoot at the different power settings. I will try to post some sad boring video later.
Test 1 shot in direct sun about 25ft depth, 20ft viz
At 3ft from subject: Level 1 no light on subject, Level 2 no noticeable light on subject, Level 3 light on subject and getting some color, Level 4 light on subject and lighting about 4-5sqft area around subject as well.
At 6ft from subject: Only level 4 put some light on the subject and started to see color around subject.
Test 2 shot in deep shade, inside a structure 20-25ft depth, 20ft viz
Here level 3 and 4 gave fair light up to 6-8 feet out covering about 8ft x 8ft area.
The beam angles did not seem as wide as my Fisheye. On several occasions I found I had to point them in to get light on a subject 4-6 feet away.
The lights preformed as well as my Fisheye 20watt and the light seems to be significantly whiter than the Fisheye. For close up and overcast conditions I think they are fair performers. I look forward to getting them out at night and seeing how they do. I know many video shooters want to get rid of their lights with cables and battery packs but I don't know if this setup would meet high-end users needs.