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Back to PAR, these values are most important as they represent the "useable light"; however, not all organisms, and clams in particular, utilize the same PAR. This is due to the fact that their are many subtypes of zooxanthellae resulting in different light absorbtion spectra. Contrary to what would be thought, coloration (such as mantle color) has little to do with light spectra absorbed, as these only represent fluorescent proteins that have no part in photosynthesis. As I have found in my experiences and those of others, clams are unique, individual organisms that can be usually found within certain ranges of the reef habitat, yet that doesn't mean that's where they do best. Where clams are found in nature represents an area of toleration (within a wide range of growth) as far as lighting, nutrients, and current are concerned, but most importantly represents an area of low predation and hydrodynamic impact. To determine "YOUR" clams best closed habitat, one should experiment with position and types of lighting.
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