I also run a duel pulse start. Although I assume by posts like some here & some from RC, that my ballasts does not drive them as bright as the HQI does.
They however, drive them a lot brighter than my regular ballast does. Yesterday, I fired up a new Iwasaki, in my PFO. Besides ugly, its not that much brighter than my Radiums. And yes, I have read all the tests.
My Radiums are bright enough to bleach new corals. I cannot say which is better, as mentioned, I have never seen them on HQI in person.