I just added 2 of the Sun blasters to my 2 OR t247 LED's. I am using 2 Giesemann Aqua blue plus bulbs, 1 in front and 1 in back. Just started Sunday with 1 hour a day and will move it up 1 hour a week until I get 4 hours a day. I really helps with the shadowing I get from the LED's. Time will tell if it helps with growth and color. I cant see why it wouldn't though.
Side note, I went to FAOIS to get my bulbs and they say they prefer the Giesemann bulbs to the ATI bulbs. With all the praise they get on here why does everyone still like the ATI bulbs better?