Phillips CFL - The Planted Tank Forum
Old 11-27-2008, 05:24 AM Thread Starter
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.)

Jhonty is offline

Old 11-27-2008, 05:49 AM
Planted Tank Enthusiast

Join Date: Oct 2007
Posts: 883
Um, you're counting wattage by the actual CFL wattage.
the 3x23w would only get you around 1wpg...
Kayen is offline
Old 11-27-2008, 06:16 AM Thread Starter
Algae Grower

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
Jhonty is offline
Old 11-27-2008, 06:23 AM
Planted Tank Obsessed

Join Date: May 2008
Location: Springville, UT
Posts: 499
Quote:
Originally Posted by Jhonty View Post
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]
airborne_r6 is offline
Old 11-27-2008, 10:10 AM
Algae Grower

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.
Old 11-27-2008, 05:35 PM Thread Starter
Algae Grower

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 .
Jhonty is offline
Old 11-27-2008, 08:20 PM
Planted Tank Guru

Join Date: Dec 2005
Location: Sacramento, CA
Posts: 20,925
Quote:
Originally Posted by Jhonty View Post
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.

Hoppy
Hoppy is offline
Old 11-28-2008, 04:30 AM Thread Starter
Algae Grower

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 )
Jhonty is offline
Old 11-28-2008, 04:37 AM
Fresh Fish Freak

Join Date: Feb 2008
Location: Tampa, Florida
Posts: 24,403
Quote:
Originally Posted by Jhonty View Post
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.

Tampa Bay Aquarium Society - Next meeting Monday, Oct 13, 2014 @ 7:15pm- See ya there!
TBAS Annual Fish Auction - November 1st!!

lauraleellbp is offline

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