pharos led unit

Discussion in 'Lighting' started by jsoli4, 11 Nov 2014.

  1. jsoli4

    jsoli4

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    Would like to know from reefers with pharos lightning what percentage white and blue point are they using and at what times during the day for the best growth ,mostly softies and lps in my tank.
     
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  3. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    I will send u a profile
     
  4. Hammerhead

    Hammerhead

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    Hi Andre

    Can you send me a profile as well.
     
  5. Lord_Blackadder

    Lord_Blackadder

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    I ramp up equal white and blue in the morning, max them both out for 3 hours and then tail off the white followed by the blue in the evening.
     
  6. soetvlei

    soetvlei

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    Hallo Andre
    Please send me a profile as well.
     
  7. 459b

    459b Moderator MASA Contributor

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    Please post profile here. What's the point in asking a question on an open forum if the answer only gets sent to a few people? We all here to learn
     
  8. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    Hi Guys, sorry for the delay in getting this info to you, I've been waiting for my SmartSun engineer to send the the profile that we have used for this unit, I will chase him tomorrow and get it across to you ASAP!
     
    Last edited: 12 Nov 2014
  9. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    Here we go as promised ! Please note that this is only a recommendation.

    [​IMG]
     
  10. jsoli4

    jsoli4 Thread Starter

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    Andre@ cant openthe file
     
  11. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    there is no file, can you see the picture ?
     
  12. jsoli4

    jsoli4 Thread Starter

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    Thanx andre
     
  13. Hammerhead

    Hammerhead

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    Perfect...if u want it to switch off later just start the sunrise later...
     
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  14. viper357

    viper357 Admin MASA Contributor

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    Those with Pharos units, do your Purple LED's also look considerably dimmer than the other LED's? I'm not sure if they are supposed to be like that or if it's a fault with my unit?
     
  15. jsoli4

    jsoli4 Thread Starter

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    must say you have a point there maybe @Andre can shed some light on this
     
    Last edited by a moderator: 26 Nov 2015
  16. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    Yes indeed I can :) Also it depends on how much is considerable, but yes there is a difference for the reasons below:

    Cree does not produce a violet LED in the range of 420nm and this is one very important spectral range for pigmentation absorption (i.e Full Spectrum Leds), anything lower is UV and actually harmful to corals zooanthellea. (A highly debatable topic still)

    So the LED used is the SemiLed, same with the Radion.

    The lower we go in Spectrum the less visible light becomes to our eyes. However this spectrum of light can penetrate much deeper into the water and this is can seen on the spectral penetration chart below. So a 700nm light source need to be much more powerful to penetrate into water when compared to a light source of the 420nm range.

    Also we don't 'see' 420nm light as bright like we see 600nm light but the spectrum show in the fluorescing of the pigmentation. For the same reason we don't see UV Rays but its intensity burns us.

    So to the human eye the violet light source appears dimmer when compared with higher spectrum sources.

    Hope this helps.

    an extract of importance:

    Note that the strongest fluorescence will be observed in 400-450nm range, particularly because the eye sensitivity in that range is very low. The light in this range is usually called "actinic light."
    Surely, coral fluorescence is one of the main factors to provide a reef tank's beauty, but the light in the 400-500nm range also has other importance: it is the most optimal light to promote marine photosynthesis. Therefore this part of the spectrum is of utmost importance for a reef tank.


    Charts courtesy from advancedaquarist.com

    [​IMG]
    Penetration of light into seawater, depending on wavelength

    [​IMG]
    Luminous function of the eye
     
    Last edited: 26 Jan 2015
  17. viper357

    viper357 Admin MASA Contributor

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    Makes sense, thanks Andre :thumbup:
     
  18. Daryl Norton

    Daryl Norton

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    I have just changed the time on my unit instead of each settings time.

    My lights only start coming on at 8 and go off at about 10, more viewing time for me:m106:
     
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  19. Hammerhead

    Hammerhead

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    Nifty trick never thought about that...thanks...
     
  20. Lord_Blackadder

    Lord_Blackadder

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    I also have the same profile, but offset so I have max output at 3-9pm.
     
  21. viper357

    viper357 Admin MASA Contributor

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    Has anybody reduced the height of their units over their tanks or is everyone using the supplied metal stands? I'm thinking of reducing the height of mine as I have a few sps on the substrate and also want to get a small clam.

    Also, any idea what angles the lenses are? 60 or 80 or 90?
     
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