Watts per gallon, T5 vs MH

Discussion in 'Lighting, Filtration & Other Equipment' started by clancaster23, Dec 23, 2011.

  1. clancaster23

    clancaster23

    Joined:
    Jan 16, 2011
    Messages:
    760
    Likes Received:
    9
    I'm looking at metal halide lighting but am noticing that the wattage they put out is much higher that what my T5's do and more that what I was told is recommended which could end up in melted corals. Example, a MH fixture that could put out 716 watts of light which is 9.54 watts per gallon. Would this be too much light for a reef tank? I want to be able to have whatever I want in the tank so I need all the light I can get but how much is too much? They have one that has 408 watts (5.44 wpg) and 608 watts (8.10 wpg). I'm leaning towards the 608 watt.
     
    clancaster23, Dec 23, 2011
    #1
    1. Advertisements

  2. clancaster23

    BL1 ............. Moderator

    Joined:
    Feb 6, 2010
    Messages:
    7,933
    Likes Received:
    1,370
    Location:
    TN, USA
    I currently have 716w MH/T5 over my 75 and it's not too much. What you have to think of is that it's only 500w of MH and 216w of T5 (and the T5s don't have individual reflectors so it won't be as effective for lighting). I use the T5 in my fixture mainly as accent lighting to get the colors of my corals the way I want them to look.
     
    BL1, Dec 23, 2011
    #2
    1. Advertisements

  3. clancaster23

    Zissou What about my dynamite? VIP Member

    Joined:
    Oct 25, 2007
    Messages:
    979
    Likes Received:
    140
    Location:
    Alaska
    Watts per gallon is not a very good means of measuring actual light in your tank. 100 watts of PC light is not as bright as 100 watts of MH, while 500 watts of MH might be less light than 150 watts of LED, etc.

    Without a par reader, there's really no telling how much light you're getting. All you can really do is either place the corals near the bottom and move them up towards the light as they adapt, or place the corals where you like and lower the light over them gradually, while watching them for any signs of improvement, distress, etc.

    Your best option is too just see what everyone else is using for your size tank, and after you choose a set up, making sure you give the corals some time to adapt while watching for changes.

    Oh, and when you set your lights up, you'll want to incorporate some way to adjust their height, either by a hanging kit or building some sort of provision in your canopy.
     
    Last edited: Dec 23, 2011
    Zissou, Dec 23, 2011
    #3
  4. clancaster23

    Northstar24 The Tang Herder

    Joined:
    Apr 22, 2010
    Messages:
    2,886
    Likes Received:
    380
    Location:
    Milwaukee, WI
    Watts per gallon is pretty much a useless measure these days, with things like T5's with individual reflectors and LED's becomming commonplace. Whats more important is how deep your tank is, and making sure that you have lights that will cover not only the horizontal span of your tank, but its depth as well

    As far as being able to melt corals - its certainly possible - I melted some green slimer Acropora after switching to LED's because I did not properly acclimate the coral to the light. As long as you acclimate existing corals to the new lights (by moving them lower in the tank, or by shortening the photo period temporarily) You should be fine
     
    Northstar24, Dec 23, 2011
    #4
    1. Advertisements

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
  1. Nedim

    Watts per gallon

    Nedim, Jan 15, 2007, in forum: Lighting, Filtration & Other Equipment
    Replies:
    15
    Views:
    2,282
    JellyMan
    Jan 26, 2007
  2. bri74

    min watts per gallon

    bri74, Mar 18, 2008, in forum: Reef Fishes
    Replies:
    4
    Views:
    851
    bri74
    Mar 19, 2008
  3. Keaton

    Watts per gal. for anemones question.

    Keaton, Jan 18, 2009, in forum: Invertebrates
    Replies:
    9
    Views:
    1,396
    bobby
    Jan 18, 2009
  4. EliWhitney314

    How many watts per Gallon do I need

    EliWhitney314, Nov 25, 2009, in forum: Invertebrates
    Replies:
    26
    Views:
    6,836
    EliWhitney314
    Nov 30, 2009
  5. Hiker4twenty

    Watts Per Gallon, Is there too much?

    Hiker4twenty, Dec 2, 2009, in forum: Lighting, Filtration & Other Equipment
    Replies:
    2
    Views:
    1,206
    daugherty
    Dec 2, 2009
  6. chuysvt

    light?????? how many watts per gallon?????

    chuysvt, Jan 27, 2010, in forum: Lighting, Filtration & Other Equipment
    Replies:
    15
    Views:
    10,306
  7. Kwater

    watts per gallon

    Kwater, Oct 12, 2010, in forum: Corals
    Replies:
    6
    Views:
    2,076
    Kwater
    Oct 13, 2010
  8. Adam Ross

    DIY T5 retrofit for my T247 LEDs

    Adam Ross, Jan 12, 2017, in forum: Lighting, Filtration & Other Equipment
    Replies:
    0
    Views:
    407
    Adam Ross
    Jan 12, 2017
Loading...