New To Forum and CO2 - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 05-14-2011, 03:11 AM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: May 2011
Location: Santa Rosa, CA
Posts: 6
New To Forum and CO2

I have a 100gal Acrylic aquarium with 4 T5HO lamps at 54 watts each for a total of 216 watts. Is this still considered medium light?

Thank you
wshack is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 05-14-2011, 03:30 AM
Planted Tank Guru
 
PTrader: (84/100%)
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 21,012
I assume the tank is around 24 inches high. If so, 4 T5HO bulbs will give you very, very high light, far more than you will be able to manage well. Of course, if you have that light hanging at least a foot above the top of the tank, the light won't be nearly as bad.

Hoppy
Hoppy is offline  
post #3 of 4 (permalink) Old 05-15-2011, 01:06 AM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: May 2011
Location: Santa Rosa, CA
Posts: 6
Now you have confused me, thats less than 3 watts per gallon. And this is very high light? Just trying to figure this part out. The tank does have a CO2 system on it.

Bill
wshack is offline  
 
post #4 of 4 (permalink) Old 05-15-2011, 02:16 AM
Plant Clown
 
kevmo911's Avatar
 
PTrader: (32/100%)
Join Date: Sep 2010
Location: Greensboro, NC
Posts: 4,729
Watts per gallon doesn't take height into consideration. If, for example, you have a 54w bulb directly on top of a 55g aquarium, that's 1wpg. And yet if you were to suspend it ten feet above the aquarium, that's still 1wpg. Similarly, at substrate level, a bulb above a 12" high tank vs. a 24" high tank will have massively different lighting levels, regardless of no change in wattage.

In addition to height, a 48" T5HO bulb gives off drastically more light than a 48" T8 bulb.

In addition to height and bulb type, a good (versus nonexistent) reflector on the bulb can increase lighting by 2-3 times. So a 48" 54w bulb with a good reflector might produce twice as much light as the same exact bulb with a poor reflector.

Anyway, forget about watts per gallon. It's useless for our purposes. Check the PAR sticky in the lighting forum here for more information. Oh, and listen to Hoppy. He tends to know what he's talking about
kevmo911 is offline  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome