Stupid question incoming:How much light? PAR?

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Stupid question incoming:How much light is needed? On top of that, what spectrum?
I have a set of TMC V2 Ilumenaire led's and the red, blue and whites can be adjusted, so as a rule of thumb, what would you guys have?
(@mightyhatter I knew you'd like this, as you like the rule of thumb)
I saw a video on you tube that said something more or less along the lines of: fish can only see what we woulkd consider the blue spectrum, and the white and red LED's are really only for when we have visitors that want to see the tank.
Sounds a bit extreme, but somewhere in that lies the truth.

ajm83

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Reply #1

It really depends on the individual coral, flow rate and the level of nutrients in the tank, etc etc. 

Off the top of my head, i work roughly to this:
  • softies (zoas,  leathers, mushrooms) : 75 - 150 uMol
  • LPS (blasto) : 50 uMol
  • LPS (acans, favia) : 100- 150 uMol
  • LPS (torches/hammers) 100-250 uMol
  • SPS (montis, seriatopora, deep water acros) : 200 - 300 uMol.
  • SPS (acros) : 250- 400 uMol.

If you've got coral in there,  I would make any changes slowly (over a few weeks) and observe that the corals don't start to bleach.

If not,  personally I'd just get the blues to the right level for the PAR you want, then add in white until it looks good and dip them both a little bit to bring the PAR back into range.

I read a while ago that excessive red can cause bleaching, so careful with that channel.  👍🏻
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ajm83

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Reply #2

Morning, I remembered that Seneye have a list of recommended PAR for some corals:

https://answers.seneye.com/index.php?title=en/Aquarium_help/What_is_PAR_%26_PUR_%3F/marine_coral_reef_PAR_levels
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semiroundel

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Reply #3

Thanks Andy, there's nothing in there at the moment, the lights are off cos of the algal bloom, I'll have to keep doing water changes till the nitrate level is acceptably low.
But softies are my main priority until I have a decent regime under my belt.
But with PAR adjustments/ coral placing I can see that the light meter alone was worth the purchase, especially as there's no reasonably viable alternative on the market in uk.

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