I haven’t used the Lumenbars for very long so I can’t say much about how well they grow coral. I took a leap of faith after seeing Dong’s tanks (Acro Garden) lit with RB Photons and Lumenbars.
On my new tank I have Royal Ice (Blue) and High Octane UV bars for supplemental light. The blue bar adds about 80 PAR around 18” down mounted at 6.5” above the water (rocks are about 11.5” down from the waterline) - 11” away from the glass, and around 70-80 PAR about 17.5” down from the waterline and 3.5” away from the glass. The HO UV bar adds around 30-40 measurable PAR. Measurements were taken with a Quantum MQ-210 with all flow turned off.
My impressions are that the RB Lumenbars are “cheap” LEDs similar to the Orpheks. I have not owned an Orphek fixture, but I suspect that the build quality of the 2 brands is similar based on photos of the Orpheks. The Lumenbars feel solid and are nicely sealed, but the included driver looks and feels super cheap. FWIW RB sells an upgraded, dimmable driver (Mean Well) for $65-$80 per driver.
The RB Lumenbars have Epistar LEDs which I have not found much information about. For reference, the RB Photon fixtures have Cree LEDs and the Orpheks have unknown LEDs custom made for Orphek. The RB and Orphek drivers appear to be the same or similar drivers at least from photos.