Number of led i need?
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Old 10-25-2014, 10:08 PM   #1
Kavak
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Number of led i need?


Hi
I have full plant aqua/its 6gallon
I follow lsi to find my number of led
My aqua is 14.5*9.5 in
So 14.5×9.6=137s.inch
I choose 25lum for mid light to high because of my plant
So i get 3425
Idevide it to lumen of led i want to use to find number of leds
3425/100=34 led???????????for 6 gallon
Also i saw other source that wrote .6 wpg for high lightso 6gallon×.6=3.6 led
So diffrent
So how i can find true number?

Last edited by Kavak; 10-25-2014 at 10:11 PM.. Reason: A
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Old 10-26-2014, 07:57 PM   #2
Kavak
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Any idea?
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Old 10-27-2014, 12:27 PM   #3
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???
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Old 10-27-2014, 01:52 PM   #4
klibs
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There is no 'true number'. This is yet another classic example of trying to hit some 'magic number' when setting up a tank. It is more of an art than a science.

I told you this in another thread and I will say it again:

As long as you have more than enough light and a dimmer you will be fine. You can dim and adjust your lights as much as you want.

I run 2 BML XB fixtures on my 75 gallon at like 50% and they work great. They put out WAY too much light so I dim it down and get good results. If you make an LED fixture with more power than you need simply dim it. That is the main advantage of LEDs IMO.

There is no magic # for how much light you need. We can only estimate - every tank is different and there are infinite factors at play here.

Just mimic someone else's build who has a successful tank and see what happens. No user here is going to say "Yeah just get 34 LEDs" because truthfully nobody knows what you really need.
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Old 10-27-2014, 07:51 PM   #5
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Tnx so much for ur bests guide
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Old 10-30-2014, 06:10 AM   #6
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Quote:
So 14.5×9.6=137s.inch
I choose 25lum for mid light to high because of my plant
So i get 3425
Idevide it to lumen of led i want to use to find number of leds
3425/100=34 led???????????for 6 gallon
Also i saw other source that wrote .6 wpg for high lightso 6gallon×.6=3.6 led
Let me understand:

137 * 25 = 3425
Your LEDs are 100 Lumen per LED.
"3425 / 100 L/LED = 34 LED" means it is 3425 Lumen.
"137 sqin * 25 = 3425 Lumen" means it is 25 lumen / sqin

25 lumen / sqin = 25 * 1550 lumen / m^2 = 38780 lux. Wikipedia (lux) says direct sunlight is 32k-100k lux.

I have a 10g tank (0.1548 m^2) with 1100L bulb (7105 lux), and another T8 at 410L (2648 lux), assuming all the light gets focused to the bottom of the tank. I am under the impression those are considered mid light level and low light level, though I have never measured it.

This thread http://www.plantedtank.net/forums/sh...d.php?t=189500 throws the statement "76 lux per PAR". http://www.plantedtank.net/forums/sh...d.php?t=105774 shows mid-to-high would be 70 - 90 PAR. That would be 5320 - 6840 lux.

Granted, my numbers are overestimating lux; reducing to "70% of bulb light reaches substrate" would yield 5005 lux and 1853 lux or 65 PAR and 24 PAR which are upper low-light and middle mid-light. On the PAR vs distance chart, T8 @ 12 in is at about 25 PAR (upper low-light).

What is "25 lum"? What is your reference? What LED is 100 L/LED?
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