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Old 10/10/2019, 06:35 PM   #1
shirley386
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Increase photoperiod?

When I realize that my DIY LEDs are not putting out enough PAR would it do any good to simply increase the photoperiod a couple of hours a day?


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Old 10/10/2019, 07:18 PM   #2
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No...

What par level?


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Old 10/10/2019, 08:19 PM   #3
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Somebody else tested it for me and I don't remember the values but he said they were low.


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Old 10/11/2019, 08:03 AM   #4
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Got pics/specs on the DIY LEDs?
Specs on tank?
Pics of tank?
Types of corals?
,etc...


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Old 10/11/2019, 08:13 AM   #5
shirley386
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180 gallon - Acropora
dKH - 8.4
NO3 - 3
PO4 - .06
Temp - 76.8 - 77.1
Protien Skimmer and Calcium Reactor


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Old 10/11/2019, 09:57 AM   #6
five.five-six
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What kind of coral are you growing?

Are they growing?


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Current Tank Info: SCMAS Member 225 peninsula euroreef RS180 Apex 400W X 3 20k radiums / Spectra mixed SPS
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Old 10/11/2019, 10:43 AM   #7
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I was hoping for useful information on the construction/components/current ratings,etc.. of said LED fixture and dimensional data to attempt to calculate its usefulness..
Wasn't sure if you wanted more help than just "nope.. spend money on a new light"


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Old 10/11/2019, 08:52 PM   #8
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I was just hoping for some general ideas of whether increasing the photoperiod would help corals when the light is not as intense as it should be.

Thanks anyway.


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Old 10/12/2019, 08:58 AM   #9
five.five-six
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Quote:
Originally Posted by shirley386 View Post
I was just hoping for some general ideas of whether increasing the photoperiod would help corals when the light is not as intense as it should be.

Thanks anyway.

so, if the light isn't intense enough, no photo-period will get it. if it's close or on the cusp, you might be able to get there by leaving the lights on longer. It depends on what sorts of coral you are growing or intend to grow.


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Originally posted by yellowslayer13:

"I hate that hole"

Current Tank Info: SCMAS Member 225 peninsula euroreef RS180 Apex 400W X 3 20k radiums / Spectra mixed SPS
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Old 10/12/2019, 11:22 AM   #10
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Quote:
Originally Posted by shirley386 View Post
I was just hoping for some general ideas of whether increasing the photoperiod would help corals when the light is not as intense as it should be.

Thanks anyway.
Ok...Then nope...Time to upgrade your lighting...


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Old 10/14/2019, 07:38 AM   #11
Kevin Guthrie
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To emphasize the above, increasing the photoperiod might help but probably won't be enough. Here's why.

All plants, including symbiotic algae, produce food during lights on but also consume it 24/7. During lights on there has to be more production than consumption, so as to make up for the consumption during lights off plus "some to grow on". If your lights are so dim that there is net consumption during lights on then no increase in photoperiod is going to fix things. If OTOH there is net production during lights on then increasing the lights on period will produce more food.

Another thing that will have a small effect is to set the tank temperature at the low range, because respiration (consumption) increases with temperature.

However, the "some to grow on" has to be substantial for the corals to thrive. If they are declining due to not enough light, it's doubtful that pushing the photoperiod will be enough for them to thrive.



Last edited by Kevin Guthrie; 10/14/2019 at 08:36 AM. Reason: Clarity
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