I don't know about tripling in height, but it definitely doubles. I've got visual proof to back this up, and this is a lone plant, no other to compete with in it's domain. Sativa dominant hybrid, if a hybrid at all.

Not ONLY that, but this plant stretched even more after that doubling, and it still stretched a centimeter or two after the last picture.

Oh, sure the plant's mass will triple and even sometimes more, but we're talking about height, right?

Notice that in the last two pictures some of the plant's branches were repositioned in and pulled down to the 'The Rack' to reduce the height a few inches. Now, in the last picture, it's reacquired it's former height and then some.

First picture: March 16th, 2006 [ about a week after 12/12 induction ]
Second picture: March 19th, 2006
Third picture: March 27th, 2006
Fourth picture: April 21st, 2006

Sorry for the quality, but it gets the point through.