I use 2 of them. According to my Seneye I was getting 500 PAR at the water surface. I also have a couple of 48W T5 Actinics and new growth on the browned out Acros that I rescued from the LFS are showing good colour. I also see new growth on a skeleton of a Blue Staghorn that RTN'd within 2 days of me getting it. the one polyp that I could see, plus another that I couldn't see are now dime sized, so I am happy with them. I only have a Reefer 350 as my main. I am also seeing a lot of green around the mouth of my Bowerbanki that is halfway down.
When I use my Blacklight at night, fluorescence levels were better with the REEFLED 90's but are even better now I have the T5s as well. Although I would need to confirm that yellow fluorescence from my Bowerbankii was healthy.