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Re: red light
Pete Mohan said....
>The latest discussion of spectrum vs. intensity brings up an issue that has
>been puzzling me. My first plant tanks were lit entirely with incandescent
>floods, because that's what I had available. I had terrible algae problems
>but my Rotalas were deep red. I replaced the floods with a 175 watt, 5500K
>metal halide when I set up a larger (70 gallon) tank, and the Rotalas now
>refuse to redden even tip near the surface in the portion of the tank directly
>under the MH. Oddly, the red melon sword I recently bought is reddening as
>expected. Has anyone discovered that red emmisions are critical for color
>production in certain plants? I would expect that anyone using JUST mercury
>vapor lamps or 6500K fluorescents might have encountered this phenomenum, if
In my 30 gallon both Rotala macrandra and Rotala indica redden under the
5200K MH 175. Maybe you need more light.
ac554 at FreeNet_Carleton.ca