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#1
10-09-2002, 05:34 AM
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Hi,
Okay...let me try this again since I totally missed the entire question... Does intensity change with depth (in nature) ? Yes. At deeper and deeper water depths, more and more red light is filter. The yellow/green is not as filtered as red. And the blue/violet is the least filtered. To answer the third question, yes the blue is of lesser intensity; however, the filtering effects of 10m of water is not too bad for blue light. I would say that 75% of the blue still makes it through 10m of water. Red/Yellow and green are non-existant. In this example, depth does change the kelvin of the lighting -- deeper equals higher kelvin and lower intensity (PAR for example). For MH and NOs, it is not quite the same story because the light spectrum is in bands while sunlight is full spectrum. - Victor. 
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