Lighting Confusion - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 12-11-2010, 01:36 AM Thread Starter
Planted Member
Tyger's Avatar
Join Date: Dec 2010
Location: Annapolis, MD
Posts: 184
Question Lighting Confusion

Aquarium Information:
  • Aquarium (36x18x24h) - 65 Gallon
  • Catalina Light System (4 T5-HO 39w [6700k x2 & 10000k x2] with strand of 15-LED Moonlights w/Leg Mounts)
  • Corallife Power Center (2 6700k [10a-10p] w/addition of 2 10000k [Mid-Time 90-minute burst] & Moonlights [10p-10a]
  • Aquarium Plants Downoi (Waitlist), Cambomba Caroliniana, Anubias Barteri (Barteri, Nana, Petite), Anubias Hastifolia, Ludwigia (Glandulousa & Repens), Rotala Wallichii, Sword (Frans Stoffels)

When it comes to lighting this tank, I am a bit confused about how to sort out lighting. In the quick-and-dirty method (watts per gallon) and T5 HO factor (double output), I figure my tank is medium lite with 2 6700k (at 2.1-2.4 w/g) and high plus lite with 2 6700k and 2 10000k on for 'noon' burst (4.2-4.8 w/g). In reading the some of the information here, I hit upon PAR vs Distance, T5, T12, PC (Hoppy, 2005) and read over information and charts. According to his chart (Tank Height x Fixture Location x Light Intensity), I believe my primary lighting period is medium to high through the lower 12-inches and high to too high in the upper 12-inches and in noon burst is 'too high' pretty much throughout the entire tank. So, with regard to my questions, I would ask:
  • Given the lighting and tank specs are my estimations above close to right?
  • Given my lighting and plants, I have been thinking 4-bulbs might be too much light during noon burst. Yes, no, or maybe so?
  • Given all specs, I was wondering about light time cycles. I was considering: 2 6700k (4 hrs) then 2 10000k alone (1-hr) then 4 bulbs (30-60 min) then 2 10000k alone (1-hr) then 2 6700k (5hrs). In this manner, I get noon day sun mid-day but only 30-60 min burst really high light. Alternatively, I could just run 2 6700k (4.5-5 hrs) then 2 10000k (2-3 hrs) then 2 6700k (4.5-5 hr) w/Moonlights (12-hrs)
I am open to all advice and comments. Thank-you, in advance, for taking a momment,


The Fraternity of Dirt #54
Just because its dirt doesn't make it low tech
Tyger is offline  
Sponsored Links
post #2 of 3 (permalink) Old 12-11-2010, 02:32 AM
Planted Tank Guru
Sharkfood's Avatar
Join Date: May 2010
Location: Pittsburgh, Pa
Posts: 2,536
I run 2x39W T5HO on an identical tank. This setup has served me very well. I run them about 9 hrs/day.
Sharkfood is offline  
post #3 of 3 (permalink) Old 12-11-2010, 05:59 AM
Planted Tank Guru
Hoppy's Avatar
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,679
You can sit the lights on the top of the tank, and use 2 T5HO bulbs, if you are convinced you want high light. Or you can use that same 2 bulbs, hanging about 4-6 inches above the top of the tank, and get a much more easy to manage low medium light. If you use 4 bulbs, they need to be about 10-12 inches above the top of the tank to get reasonable high light.

Hoppy is online now  

Quick Reply

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


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

Email Address:


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
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