The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
http://www.aquariumadvice.com/bulb_comp/14K
Here is a pic of one of our members tanks with the bulbs your asking about, the pic is with actinics and before burn in, I would expect it to be considerably whiter. No clue on the growth rates, I'm sure he'll jump in here and let us know...