Lighting on 40 long
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > General Planted Tank Forums > Low Tech Forum


Reply
 
Thread Tools Display Modes
Old 11-19-2012, 05:48 PM   #1
bikinibottom
Algae Grower
 
PTrader: (0/0%)
Join Date: Nov 2012
Location: Washington DC
Posts: 115
Default

Lighting on 40 long


I have a 48" 4-bulb Tek T5HO fixture from an old saltwater setup. I want to use it on a 40 long -- 48"l x 12"w x 16"d. I'd also like to keep plants that require "medium" light, and would like to avoid CO2 (which I understand can be done with PAR = 35-50). If I used only one 54W 6500k bulb in this fixture would that still be too much PAR to avoid using CO2? I saw the sticky thread on lights/PAR, and if the Tek calculated values can be taken at face value it looks like the PAR might be about right near the bottom of the tank, but might be closer to 75-80 at the surface of the water.

Anyone successfully running a setup with one bulb 54w T5HO bulb, or have any advice for me?

Last edited by bikinibottom; 11-19-2012 at 05:56 PM.. Reason: edited PAR rating @ surface of water
bikinibottom is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-19-2012, 06:57 PM   #2
biogenetic40379
Planted Member
 
PTrader: (2/100%)
Join Date: Jan 2012
Location: Columbia, MO
Posts: 275
Default

i had one t5ho on my 55g, it was 18 inches from light to substrate, I had no problems with out co2. I should have been running co2, but i never got my solenoid to seal right. Just be prepared to read about par (which you seem to already have started) and be able to move the light up off the tank. You could ask around to rent a par meter too, someone in my city does it so i don't see why there wouldnt be on in the DC area.
__________________
biogenetic40379 is offline   Reply With Quote Quick reply to this message
Old 11-19-2012, 07:15 PM   #3
bikinibottom
Algae Grower
 
PTrader: (0/0%)
Join Date: Nov 2012
Location: Washington DC
Posts: 115
Default

Thanks, Biogen... that's a good idea about borrowing a PAR meter. I have connections with some science folks at UMD so it shouldn't be that hard to get my hands on one.
bikinibottom is offline   Reply With Quote Quick reply to this message
Old 11-19-2012, 07:31 PM   #4
bikinibottom
Algae Grower
 
PTrader: (0/0%)
Join Date: Nov 2012
Location: Washington DC
Posts: 115
Default

Hey, Biogen... were you able to grow plants that needed a "medium" level of light? I'm interested in planting things like swords and other things that need a moderate level of light.
bikinibottom is offline   Reply With Quote Quick reply to this message
Old 11-19-2012, 08:32 PM   #5
Hoppy
Planted Tank Guru
 
Hoppy's Avatar
 
PTrader: (74/100%)
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 18,376
Default

Don't forget that most plants that "require" more than low light, really require CO2 before they do well. It is the combination of light and CO2 that gets those plants to grow well.
__________________
Hoppy
Hoppy is online now   Reply With Quote Quick reply to this message
Old 11-19-2012, 09:41 PM   #6
bikinibottom
Algae Grower
 
PTrader: (0/0%)
Join Date: Nov 2012
Location: Washington DC
Posts: 115
Default

thanks, hoppy. Any thoughts on a siesta regime to increase co2? My (limited) understanding is that the co2 level goes down to almost 0 after the first 5 hours the lights are on, and that shutting them off for several hours brings the co2 level back up significantly while the plants respire. In theory, this regime would provide a little more co2 for the plants. I'm wondering if anyone has any data on whether this works or not.
bikinibottom is offline   Reply With Quote Quick reply to this message
Reply

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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

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

Forum Jump


All times are GMT. The time now is 06:29 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012