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Re: lighting for a 75 gallon.
In a message dated 06/29/2001 2:54:28 PM Central Daylight Time,
Aquatic-Plants-Owner at actwin_com writes:
I just purchased a 75 gallon Oceanic Tank and stand.
I’m now buying the lighting system. I know I want to
keep some carpet plants in the front of the tank.
Either Echinodorus tenellus or dwarf sag and
hairgrass. Maybe pearlgrass or sunset hygrophila. I
haven’t committed to other plants yet but I don’t
think I’ll be keeping many really high light or red
plants. I will be running CO2. I have decided to go
with AH Supply lights. Now I’m wondering what lights
Lets look at some of the the basics here. First off
you have a 75 gallon tank with a surface area of 48"
X 18 inches. With the 75 gallon total volume I'd normally
recomment 225 watts maximium initial light.
Looking at the AH fixtures to get near the 235 watt
total you would either use 4- 55 watt units for 220 watts
total or 2 96 watt units which would give you 192 watts
The draw back with the twin 96's is that they are about 36" long
and would overlap in the center giving you a potential hot spot.
With the 4 55 wat units they could be much easier devided up
to give you even lighting over the entire tank.
Next comes the selection of bulbs. My personal therory is a combination of
color temperatures helps assure a better coverage over the entire light
which helps asure better color viewing as well as lighting that covers all
the prefered color temperatures the plants require. For standard florescent
bulbs I find that either a combination of 50K and 72K or 50K and 100K do a
fasntastic job for me. With the selection of bulbs that AH has available
I'd probably select a pair of 53K bulbs in the front and a pair of the 67K
the back. In the event that the higher Kelven temperatures may be deficient
in the future I'd consider replacing one of the 67K;'s with a 100K only as a
resort. I have found that 100K bulbs are not always as pleasing to the eye
create more light in the blue ranges than desired by themselves.