06-20-2013, 05:24 PM
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Originally Posted by Vpaw
What's the difference between mine and e ultra sun?
Primarily, the colour temperature which is measured in Kelvin. The Flora-Sun is 5500K (kelvin), the UltraSun is 6500K. So the "colour" of the 5500K is warmer than the 6500K, which is cooler than the other. Warmer means more red, less blue; cool means more blue, less red.
The colour is to some extent just a matter of personal preference. But it does go a bit deeper, because plants do grow a bit better under 6500K. It is thought to be the additional "brightness" of the yellow/green wavelength that is missing in the warmer light. Fish colours also tend to be more natural, because this light is closer to natural sunlight.