[APD] Fish response to light levels

["Phillip Grobler" <pfgrobler at hotmail_com>]

Lumen readings are based on the humen Eyes response to light.
How do fish's eye's respond to light, is it similar to humen response to
light ?

Say we take
A - The Sera Deep blue 36 Watt -     300lm and PUR-efficiency  of 0.77.
B - The Sera Daylight  36 Watt -    3250lm and PUR-efficiency of  0.72

To the humen Eye A will look rather dim and B quite bright
To plants both will be about equaly bright
How will fish see the bulb - will fish also see A as dim and B as bright or
not.

When keeping fish that perefer lower light levels would it make more sense
to use bulbs with low lumen ratings but high  PUR-efficiency  ratings ?


Phillip Grobler
Cell: +27 083 654 0250
Instant messaging:
MSN: pfgrobler at hotmail_com
Yahoo: pfgrobler at yahoo_co.uk

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