DoubleDs was trying to maximize weight per plant because of limited number of plants he could grow per Canadian law. I believe there are better ways to grow, but this a very exciting way to grow. Rapid growth because of tons of light and lots of water and mutes.... He stared his clones with a 600 HPS, so they wouldn't get lumen shock, when they were dropped into a bucket with 4 1000W lights surrounding it.
In 2008 when I was in communication with DoubleDs he told me he rooted his clones with 600w on an ebb n flo table. When they were a foot tall he would move them to the flower room. Keep in mind he had a very special plant with many fingers on each leaf.