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So if the Kelvin scale and coloromitry is not the way to choose an aquarium bulb the how does every one rate bulbs for plant groth? What is the best "rating" to loook for when getting bulbs for planted aquariums?
To give anything less than your best is to sacrifice the gift. -- Steve Prefontaine
My objection applies to most other colorimetric units. I have found it
useful to look for the lowest lumens/Watt in a tube to get best plant
growth (e.g., "daylight" vs "cool white"). Our eyes are 10X as sensitive
to green as to red or blue, but plants reflect away most green light and
absorb the most only in the red and blue chlorophyll absorption regions.
Colorimetry (lux, lumens, ft-Lamberts,candles etc.) would be great for
aquaria if our eyes responded like the plant action spectrum. They don't
though, so some adjustment in thinking often is needed.
Colorimetry and its units were developed primarily for merchandising.
Does the dress look good in the store window? Does the meat in the tray
look bright and fresh? Is it a good reading light? It is all (and only)
about how humans perceive light and lighted objects. We just need to be
cautious about their use in situations where human perception differs
from the true needs of the aquarium.
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