Have have both an ATI blue plus bulb... and orphek blue plus - both to supplement orphek atlantiks - which did not quite give me the spread or color I wanted.
I added the T5s first and they did not quite get the job done (mind you this is a huge tank). Helping to balance out the strong channel 1 whites of the Atlantik did not quite happen.
I added the blue plus orpheks which did a much better job at bringing out colors from the corals and I finally started getting growth out of the SPS near the edges. Love them.
In summary...
The orphek blue plus does not spread the light as much as a single T5 on a reflector, and the color is definitely more blue and UV versus an ATI blue plus. They do punch down and are visually much brighter than a single T5 and bring out the colors for my particular corals better than the single T5. It really worked for me... (but, I kept the T5 too LOL). If I had to pick, I would keep my orpheks over the T5.