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11-27-2008, 04:24 AM   #1
Jhonty
Algae Grower

Join Date: Mar 2008
Location: Iselin, NJ
Posts: 30

# Phillips CFL

I have a 80g tank and want to go for a planted one. I am planning to use phillips CFL for the plants. As per the thumb rule of 2W-3W / gallon, I would need appr. 80*3W = 240W. The CFLs are 6500K.

My questions
Which one is better
1) 3*23W (each o/p = 80W appr.)
2) Or should I go for 1*100W (o/p = 250W appr.)

 11-27-2008, 04:49 AM #2 Kayen Planted Tank Enthusiast     PTrader: (0/0%) Join Date: Oct 2007 Location: Canada Posts: 852 Um, you're counting wattage by the actual CFL wattage. the 3x23w would only get you around 1wpg... __________________
 11-27-2008, 05:16 AM #3 Jhonty Algae Grower   PTrader: (0/0%) Join Date: Mar 2008 Location: Iselin, NJ Posts: 30 Can you pls elaborate ? Should I count the actual watts 3*23W = 69W or Should I consider the output comparable to an 80 watt incandescent 3*80W = 240W
11-27-2008, 05:23 AM   #4
airborne_r6
Planted Tank Obsessed

Join Date: May 2008
Location: Springville, UT
Posts: 499

Quote:
 Originally Posted by Jhonty Can you pls elaborate ? Should I count the actual watts 3*23W = 69W or Should I consider the output comparable to an 80 watt incandescent 3*80W = 240W
I am not an expert by any means but I believe that you count the actual wattage of the CF so 3*23W=69W.
__________________
[/off-rant]

 11-27-2008, 09:10 AM #5 Logan's Daddy Algae Grower     PTrader: (0/0%) Join Date: Jul 2008 Location: Oregon Posts: 48 Yeah, when using the WPG rule on CFL's you need to use their actual wattage, not their "equivalent" wattage. a 23w (80w equivelant) is just 23w. Also, since they are round and about half of their light does not end up in the tank (i don't care how good your reflectors are) they really only count for about 2/3 of their rating so the 23 watters are now 15.5 ea. For Your 80g tank you need 13 of the 23w bulbs. My 34 is currently set up this way, I use 8 of the 23w bulbs works great. IMO you would be a lot better off using 4 foot shoplights with 32w t-8 bulbs in them (3 shoplights for a total of 6 bulbs and 192w (2.4 WPG) It would be a lot cheaper and more efficient.
 11-27-2008, 04:35 PM #6 Jhonty Algae Grower   PTrader: (0/0%) Join Date: Mar 2008 Location: Iselin, NJ Posts: 30 Thanks you guys ....!!! I think other option I can go for is use 2 100W CFL (each o/p equivalent = 250W) Hope this does not become too bright .
11-27-2008, 07:20 PM   #7
Hoppy
Planted Tank Guru

Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,433

Quote:
 Originally Posted by Jhonty Thanks you guys ....!!! I think other option I can go for is use 2 100W CFL (each o/p equivalent = 250W) Hope this does not become too bright .
The biggest problem will be the heat produced by such big CFL bulbs. Don't try this without having a fan blowing through the light fixture to keep the bulbs cooler.
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Hoppy

 11-28-2008, 03:30 AM #8 Jhonty Algae Grower   PTrader: (0/0%) Join Date: Mar 2008 Location: Iselin, NJ Posts: 30 Great tips !!! I have a fully covered wooden hood. Now a dumb question .... what would be good ..? 1) Fan blowing the air out of the hood (fixture) eg. exhaust fan. OR 2) Fan blowing the air onto the fixture -- to keep the bulb cooler. (may be I will reverse the exhaust fan to blow the air in (:0 )
11-28-2008, 03:37 AM   #9
lauraleellbp
Fresh Fish Freak

Join Date: Feb 2008
Location: Tampa, Florida
Posts: 24,403

Quote:
 Originally Posted by Jhonty Great tips !!! I have a fully covered wooden hood. Now a dumb question .... what would be good ..? 1) Fan blowing the air out of the hood (fixture) eg. exhaust fan. OR 2) Fan blowing the air onto the fixture -- to keep the bulb cooler. (may be I will reverse the exhaust fan to blow the air in (:0 )
Both if you can.
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 Tags 80g, cfl, phillips

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