Photo period question - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 01-20-2013, 08:14 PM Thread Starter
Algae Grower
PTrader: (0/0%)
Join Date: Sep 2012
Location: Salt lake city utah
Posts: 12
Photo period question

Hi everyone
Are 4 T5HO on for 4 hours a day the same as 2 bulbs on for 8?
Animanganime is online now  
Sponsored Links
post #2 of 3 (permalink) Old 01-20-2013, 10:08 PM
Planted Member
Rich Guano's Avatar
PTrader: (0/0%)
Join Date: Jan 2012
Location: Arnoldsville, GA
Posts: 217
In regards to energy consumption, given lamps of equal value I will say yes.

In regards to plant photosynthesis, you may be over simplifying this. You can't overclock a plant. The plant will utilize as much light as there is co2 and nutrients available, anything more is wasted light energy. Depending on your setup two lamps may maximize your growth productivity.

There was an old quote from this site. Only Bad things happen quickly in an aquarium. Good things take a long time to happen. I believe HOP is the author.

Have an open mind, but not so open that your brains fall out.

Think outside the glass box.
Rich Guano is offline  
post #3 of 3 (permalink) Old 01-20-2013, 10:11 PM
Darkblade48's Avatar
PTrader: (3/100%)
Join Date: Jan 2008
Location: Toronto/Singapore
Posts: 9,809
Originally Posted by Animanganime View Post
Hi everyone
Are 4 T5HO on for 4 hours a day the same as 2 bulbs on for 8?
No. Lighting in general does not work that way.

Light intensity != lighting duration

Edit: As Rich Guano mentioned, in terms of energy consumption though, they are equal


A Primer to Pressurized CO2 and A Primer to Planted Tanks
Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Eheim 2217, Eheim surface skimmer and Eheim autofeeder.
Victor Pimp #33 - HPT272-125-350-4M
Darkblade48 is offline  

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