10-25-2009, 06:16 PM
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Originally Posted by MoneyMitch
Thank you guys so much again, now i dont mean to beat a dead horse here but tom barr stated that you can use what you want over your plants and growth would be the same for plants under red/blue compared to household.
Check this link out tom barr comments on i think the last page. K rating on bulbs and Plants. - Aquarium Plants - Barr Report
Don't get too far ahead of yourself. I read through that thread, and Mr. Barr is not far off from what I've been advocating. He does not, as I read it, say that any light will work. He mentions the K rating being important for the appearance (the balance I mention frequently) and the cool fluorescent tubes work as well for growth; these are higher in the blue colour that plants most need. In another thread a few weeks back I suggested a mix of full spectrum and cool white to whomever it was, and I have done the same before. This is what I use on my tanks, and I know it has worked for the past 15 years.
Only recently have I discovered the reason, in a study by K. Richards that appeared in the July 1987 issue of FAMA, pp. 16-20. I don't have access to this, but it is cited in Ms. Walstad's Ecology of the Planted Aquarium
, p. 180 and 185. The experiment tested plant growth under different fluorescent tubes. The best growth, measured as the most oxygen produced by the plants, occurred under a combination of cool white and Vita-Lite which is a full spectrum tube. The second best was under cool white, and the third best under Vita-Lite. I don't know the specifics of Vita-Lite, how it compares to the full spectrum tubes like Life-Glo that we have today, but I suspect the results are close enough. Now I can see why my tanks have done so well for so many years. And I am not going to run out and change just because Mr. Barr or anyone else disagrees.