[Craig Manoukian]

On Saturday, Anthony Calfo made an interesting point. He believes that light supplies only up to 15% of the nutritional requirements of photosynthetic animals. The remainder of that requirement has to be made up of the proper foods. In other words it is better to underlight your tank than underfeed your corals.

My understanding is that the Kelvin rating equals the color and that the PAR is related the intensity or the ability of light to penetrate a certain depth. Metal Halide lighting can support a deeper tank with light than a Power Compact light, but they can both have the same color spectrum with a 10,000K bulb.

I hope this is correct as it has taken me quite some time to be able to put it in simple terms. If not, oh well, back to the drawing board. I knew I should have taken physics somewhere along the line.