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Discussion Starter #1
I have two Giesemann Powerchrome Pure Actinic T5-HO (39w) bulbs that came with my Tek-Light system which I never installed. It was my impression that these bulbs were for Reef tanks and would result in bad things (A word) in a freshwater tank.

Is that correct?
 

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Discussion Starter #6
Ok, they don't do much for plants (photosynthesis)....but will they encourage the dreaded Algae growth? I thought I read that the blue light leads to Algae.

If I just want a "color" change because I like it, I could have 3 daylight and 1 pure actinic?
 

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Pure actinic are around 460 nm and this is just outside the range of photosynthesic activation.



I do know that if light beyond the red action spectrum actually turns off photosynthesis. I dont know if this holds true for the blue action spectrum.
 
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