Photo period question - The Planted Tank Forum
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post #1 of 3 (permalink) Old 01-20-2013, 08:14 PM Thread Starter
Algae Grower
Join Date: Sep 2012
Location: Salt lake city utah
Posts: 35
Photo period question

Hi everyone
Are 4 T5HO on for 4 hours a day the same as 2 bulbs on for 8?
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post #2 of 3 (permalink) Old 01-20-2013, 10:08 PM
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Location: Arnoldsville, GA
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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.
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post #3 of 3 (permalink) Old 01-20-2013, 10:11 PM
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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


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