We've been playing with our actinic supplementation and I think we've finally got it. We mounted a pair TruLumen 3 LED strips on each end of the HQI light fixture. That worked okay but we wanted something brighter. Yesterday we bought one of their 10" 4 LED strips. After trying to figure out an unobtrusive way to mount the strip I had a bit of an "Ah ha!" moment when I realized that I could mount the strip, to the underside of the aquarium top trim. The light sits about 1" above the water line so there's almost no light loss. It's very bright. Here's a couple of pure actinic shots from last night.
As amazing as these colors are, they're even brighter in person. Getting a decent white balance with that much 435nm light is a bit of a challenge.
Cheers