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Old 10-13-2013, 04:45 PM   #1
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par value

Is there a formula to use to figure out par values for led lights
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Old 10-13-2013, 05:04 PM   #2
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There is no formula. you would need a PAR meter.
If you wanted a fixture that would allow you to keep whatever you wanted, i would look for something with 2 or 3 watt LEDs. the 1 watters are fine for shallow situations, but they lack the punch for deeper tanks.
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Old 10-13-2013, 05:52 PM   #3
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Thanks.
My tank is about 14 inches deep. Now is that 1 watt per gallon minimum ?
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Old 10-13-2013, 10:38 PM   #4
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14" top to bottom? It's not per gallon, it's per emitter.
I would think you could use a fixture with 1 watt LEDs in it for a 14" deep tank. What are the dimensions of this tank?
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Old 10-13-2013, 11:10 PM   #5
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It's a 20 gallon tall. 24" long...12" wide....14" deep
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Old 10-13-2013, 11:17 PM   #6
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would this work for soft corals like zoas...


  • Dimensions - 23.00” x 5.00” x 1.00”
  • Brackets add 0.65" in height
  • Includes 27 LEDs
  • 1 watt LED
  • 1600 Lumen
  • 22x 10000K LEDs
  • 5x Actinic 460nm LEDs
  • Slim and contemporary light design
  • 2 mode on / off function for day and night use
  • Mode 1 turns on all LEDs
  • Mode 2 turns on Actinic LEDs
  • Extendable bracket - 24"-30" max extend
  • Extendable bracket - 60cm - 75cm max extend
  • Non-corrosive powder coated aluminum housing
  • Splash guard
  • 110V - 220V
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Old 10-13-2013, 11:19 PM   #7
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I would say yes. Probably something with a lot of LEDs though. Maybe 3 per row, and 12 rows. So, 3 emitters for every 2" x 12" area. I'm just guessing here, but I think that should do you well.


*edit* you posted as I answered. I wouldn't want that fixture above because it only has 27 LEDs total, and only 5 of them are blues.
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Old 10-13-2013, 11:24 PM   #8
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how about this one

  • Dimensions - 23.00” x 9.25” x 1.25”
  • Brackets add 0.65" in height
  • Includes 32 LEDs
  • 1 watt LEDs
  • 24x 10000K
  • 8x Actinic 460nm
  • 2200 lumens.
  • 1x manual two mode on/off switch
  • Mode 1 turns on all LEDs.
  • Mode 2 turns on the Actinic 460nm only.
  • Includes cooling fan.
  • Timer ready. Fixture pre-wired for add on timer module.
  • Timer module can control the 10000K and Actinic LEDs separately.
  • Timer module(s) not included.
  • 1x access port pre-wired for timer module
  • External LED drivers
  • Extendable wire brackets
  • Splash guard.
  • Slim and contemporary design
  • Extendable bracket 24"-28" (60cm - 70cm)
  • 110V - 220V
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Old 10-13-2013, 11:29 PM   #9
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Still no. I would want at least the same amount of blues as whites, preferably, more blues than whites.
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Old 10-13-2013, 11:31 PM   #10
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ok..so blue is just as or more important than white lights
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