I totally agree the Giesemann Pure Actinic bulb is VERY dim to look at, but that's funny you don't think it looks like the old UVL Super Actinic because I still use that bulb in my basement tank and I really feel that the Giesemann Pure Actinic is the closest T5 to that old venerable T12. As for the dim light that's what I love about it because it provides a dawn/dusk effect. Anyways thats what makes this hobby so great. . . plenty of choices to satisfy everyone!
Here's a pic with just the Giesemann Pure Actinics on. Its REALLY purple and REALLY dim, but I think you can get a feel for how the greens really glow

(Careful observers might note a tiny bit of rearranging- just felt the 'nem was too high and blocking the view in the back so I lowered it slightly AND I moved the green stylo and replaced it with a pink poci on the left)
Funny thing I should also mention . . . after 7 years and thinking I totally lost the colony my acans are finally growing like crazy. Don't know if it's the return to Radiums or what but they are definitely growing fast!