Quote:
Originally Posted by mrhasan
UV (390nm) on the other hand, is actually bad, possibly because the wavelength gets shorter in water from the source.
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Would you be so kind as to give a quick summary as to why this is so, 390nm falling in the UVA spectrum? I don't wish to watch a 20 minute video about full spectrum just to find out about the bad UV. A quick search on the UV spectrum seems to indicate that anything above 400nm isn't really UV, but simply a violet. So what's so harmful to coral @ 390nm? Thanx!