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at a series of depths from the surface to the depth of 1% illumination. Then, the exponential decline in light is calculated using Beer's Law with the equation:

where k is the light attenuation coefficient, I_z is the intensity of light at depth z, and I₀ is the intensity of light at the ocean surface.Which translates to:

This measurement can be done for specific colors of light or more broadly for all visible light. The light attenuation coefficient of photosynthetically active radiation

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