[titus]

Hello Steve,

I know what you mean. But the PAR meter only tells you the total energy of all light within the 300 - 700nm range. It doesn't give any clue to the spectral shape/distribution of energy "within" this band.

It is important for corals and the most meaningful, as compared to simple lux measurement, due to the meter's sensitivity to the range of light that algae responds to.

But as we know, different corals require different spectral shapes. It is best if we can somehow qualitatively log down the correlation between coral growth vs type of light (ie spectral shape).

And I'd have to disagree with the constant spectral shape for different driving intensity part. Everything in this world is non-linear. I have a gut feeling that spectral shape changes as the bulb is subjected to different driving method/intensity.

Titus