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Red light, green light
>Of course, aquarists don't go around swapping lights all that frequently
>in a search for the perfect bulb because of expense and other reasons.
>They do, however, change their plant species whenever they throw out what
>doesn't grow in their tank and try something else.
>Perhaps part of being a successful aquatic plant grower is finding the
>plants that work with the bulb you happen to choose.
I've been growing an awful lot of different plants for a pretty long time
with a number of different bulbs. I've seen only _very_ minor responses to
changes in bulb spectrum. What I _have_ seen over and over is that most
plants grow faster and better with more INTENSITY (within limits) as long
as all other plant requirements are met. I choose my bulbs in terms of
efficiency and the way I like my aquriums to look to my eye. Beyond that,
I am only concerned with providing _enough_ light.
Aquatic Gardeners Association