Here's a portion of a video I took on our dive yesterday. We're only about 35' deep at this point. My aim was to see the difference in my old light (a UK1200 Halogen) to my new Tovatek Galaxy 2500 video light.
A few years ago a dropped my UK1200 and broke the ceramic retainer for the Halogen bulb. I was able to fix it - sort of - but it turns out the bulb is now maybe a few millimetres farther out in the reflector than it used to be and now it creates a bit of a donut/halo effect. That's the first light I try out on the interior of the hull of the sunken tug. IF you look really close, you can see where I turn the Tovatek light from low, med and high.
http://youtu.be/a6A-CJx8sx8