LED Light fixture - The Planted Tank Forum
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post #1 of 16 (permalink) Old 08-11-2013, 09:59 PM Thread Starter
Algae Grower
 
Join Date: Aug 2013
Location: planted earth
Posts: 14
LED Light fixture

Hi guys!

I'm new here but i'm in this hobby for over a year.

My tank is 55 cm long, 20 cm width and 33 cm height (21.6"X7.8"X13"),
I use co2 and I fertilize on a regular basis.

I'm thinking of DIYing a LED ligh myself using 3 heatsinks, fans and LEDs.
There will be 2 outer heatsinks and 1 in the middle (the inner one).

The main issue of this thread is the LED fixture which is:

color out in out total
----- --- -- --- -----
white 4k 2 4 2 8
white 10k 2 3 2 7
white 12k 2 2 2 6
white 20k 1 1 1 3
blue 2 2 2 6
pink 1 1 1 3
red 1 1 1 3
green 1 1 1 3

total 12 15 12 39


Which will be connected to 3 drivers:
Drv1 Drv2 Drv3
---- ---- ----
3 pinks 8 4k 7 10k
3 20k 6 blue 6 12k
3 red
3 green

This division is so i can dim drv1 more the i dim 2&3 so the aquarium won't be too colorful and so that i won't have lots of algae.

I'm looking forward to read you professional comments.

Thanks!

Leeran

P.S.
Sorry for the messy tables, i tried <tabs> and <spaces> but it still looks like that... :/

Last edited by leeransetton; 08-12-2013 at 04:05 PM. Reason: less content
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post #2 of 16 (permalink) Old 08-13-2013, 04:33 AM Thread Starter
Algae Grower
 
Join Date: Aug 2013
Location: planted earth
Posts: 14
Guys?
What do you think?
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post #3 of 16 (permalink) Old 08-13-2013, 02:11 PM
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Quote:
Originally Posted by leeransetton View Post
Guys?
What do you think?
Well it looks a bit "overcomplicated" w/ too many "high blue" whites.. Though that is all a personal opinion.. I guessitimate it at all your whites in each channel come to like 10K:9K;10K;9.75K
Even w/ the colors you will still have a bluish tank... BUT that is just a guesstimate..

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post #4 of 16 (permalink) Old 08-13-2013, 08:43 PM Thread Starter
Algae Grower
 
Join Date: Aug 2013
Location: planted earth
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Thanks Jeff!

so this is the new chart:

color out in out total
----- --- -- --- -----
white 4k 2 4 2 8
white 6k 2 3 2 7
white 8k 3 3 3 9
blue 2 2 2 6
pink 1 1 1 3
red 1 1 1 3
green 1 1 1 3

total 12 15 12 39

how is that now?
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post #5 of 16 (permalink) Old 08-13-2013, 10:10 PM
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Quote:
Originally Posted by leeransetton View Post
Thanks Jeff!

so this is the new chart:

color out in out total
----- --- -- --- -----
white 4k 2 4 2 8
white 6k 2 3 2 7
white 8k 3 3 3 9
blue 2 2 2 6
pink 1 1 1 3
red 1 1 1 3
green 1 1 1 3

total 12 15 12 39

how is that now?
first.. opp's finally figured out you only have 3 strings.. though you DID mention it .. doesn't change my opinion as to the first thought.. As to this one.. Looks better to me.. As an example the 10,000K "freshwater at BML has this configuration:
Quote:
LED Selections per 12" Board: (10) 5700K Cool White, (3) 660nm Deep Red, (2) 450nm Royal Blue
You have 24:6:3:3:3 overall
or 8(average 6000k-ish):2(b):1(p):1(r):1(g)

My guess is they are close to the same..I'd use their calculator but BML is undergoing massive website updating...and it is a bit dysfunctional..
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post #6 of 16 (permalink) Old 08-13-2013, 10:32 PM
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You can super simply things by using 4 colors:

5000-6000K white
450nm Royal Blue
660nm Deep Red
420nm Hyper Violet

3:1:1 ratio of white:blue:violet

10-12:1 ratio total of red

Also you do not need that many LEDs on that tank.
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post #7 of 16 (permalink) Old 08-13-2013, 10:46 PM Thread Starter
Algae Grower
 
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Location: planted earth
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do you recommend me not to use green or pink?
why?

what do i need to look for when choosing a driver?
do i need to notice the output voltage? what about the output current?

thanks again, guys
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post #8 of 16 (permalink) Old 08-13-2013, 10:54 PM
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Quote:
Originally Posted by leeransetton View Post
do you recommend me not to use green or pink?
why?

what do i need to look for when choosing a driver?
do i need to notice the output voltage? what about the output current?

thanks again, guys
Green spectrum is barely absorbed by plants so it doesn't help with growing like red, blue, and violet does. These are the 4 photosynthetic peaks:

420nm
450nm
630nm
660nm

You also need to choose emitters first before choosing the driver. What LEDs you go with will determine what drivers/power supply you use.

White + red = pink so you don't need a pink LED.
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post #9 of 16 (permalink) Old 08-13-2013, 11:05 PM Thread Starter
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colors - got it!

this is the kind of LED i'm gonna use. it's 3W LED:


I need a 50w driver, but i'm not sure what current and voltage i need.
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post #10 of 16 (permalink) Old 08-13-2013, 11:36 PM
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Wattage is based on current and voltage not the other way around. You pick your power supply on the forward voltage of the LED and what current they are going to run at.

You need to find out what is the forward voltage of that emitter and the max current it can take. For example:

Cree XT-E
1.5a max current
3v @ 700ma

Rebel ES
1a max current
2.5v @700ma

Both of these emitters are 3W yet are completely different. Is the emitter you pictured the cheap chinese ones? You probably can't run those at more than 350ma.
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post #11 of 16 (permalink) Old 08-14-2013, 05:28 PM Thread Starter
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they cost about 1$ per LED. they can work with 700ma. is this LED considered cheap?

i'm not looking for the best LEDs, because i'll buy more than i need and run them on low wattage.
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post #12 of 16 (permalink) Old 08-14-2013, 07:51 PM
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Quote:
Originally Posted by leeransetton View Post
they cost about 1$ per LED. they can work with 700ma. is this LED considered cheap?
Yes.
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post #13 of 16 (permalink) Old 08-14-2013, 08:20 PM
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Quote:
Originally Posted by leeransetton View Post
they cost about 1$ per LED. they can work with 700ma. is this LED considered cheap?

i'm not looking for the best LEDs, because i'll buy more than i need and run them on low wattage.
That is not cost effective. Also there is no such thing as low wattage per se.

By all means you can go ahead and get a ton of those cheap $1 LEDs and load them up on a massive heatsink or spend $3 an LED on Rebels and use considerably less.

Not to sound mean or anything but you should research LED builds a bit further before buying anything as there are a lot of factors involved that you are overlooking. With the route you are taking you will end up spending more money in the long run.
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post #14 of 16 (permalink) Old 08-15-2013, 05:23 AM
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In my opinion it is best to first decide what your objective is, then you can figure out how to achieve that objective. For example, if your objective is to have a very high CRI, that guides you towards having more than just cool and warm white LEDs. Or if you want to make your red plants, and red/blue fish look very red and red/blue, that guides to towards having supplemental red and blue LEDs. But, if you just want a light that will grow plants well, look good, and possibly let you simulate sunrise and sunset, you might want just cool and warm white LEDs, but on two dimmable drivers. If you want maximum shimmer, you will want fewer, but brighter LEDs, or a few separated pendants. If your goal is to minimize the variation in PAR throughout the tank, you would want to spread out the LEDs uniformly over the whole top of the tank. But, this also minimizes the shimmer.

So, I suggest backing up a step, then after you have a clear goal, we can discuss how best to meet that goal.

Hoppy
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post #15 of 16 (permalink) Old 08-15-2013, 05:32 AM Thread Starter
Algae Grower
 
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Thanks for the straightforwardly!
What other factors am I missing?

If I use those high quality LEDs, will I still have a good light spread all over my tank?
I don't want it to look like spots of light, but as a single light source spreaded evenly.

Thanks again :-)
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