Looking for an input on DIY Led light - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 08-17-2014, 06:13 PM Thread Starter
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Looking for an input on DIY Led light

Hi there, as i made my second tank, 30x30x30 cm for a some shrimps i wanted to try out a power led's light on it before pulling a trigger on my main tank with thoose. So my plan is to use a 90x90 mm heatsink and run on it a 9 1w each led's, some of them cool white, warm white and red, blue. Also there would be a optics 60 degree and some simple dimming. And i want to ask for you guys, what is the good configuration to place led's on heatsink? i got a 10 ww 6500k and 66nm reds, also with paycheck somes a blue ones and cool whites.
made some layouts and still cant figure out which one would give me a good lighting near bottom for a some plants.
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Last edited by mr one; 08-17-2014 at 06:15 PM. Reason: missed a pic
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post #2 of 12 (permalink) Old 08-17-2014, 07:12 PM
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Id say figure d but put the red in the middle as it has the harshest color shadows


- Jeff
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post #3 of 12 (permalink) Old 08-17-2014, 07:44 PM Thread Starter
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Id say figure d but put the red in the middle as it has the harshest color shadows


- Jeff
So just switch between blue and red in places and it is good? As for a fan, i think im going to nned one or i am wrong? because such small heatsink
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post #4 of 12 (permalink) Old 08-17-2014, 08:37 PM
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I would use a fan it should help extend the life of the led


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post #5 of 12 (permalink) Old 08-18-2014, 01:19 AM
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see if you can fit this in..


What are you going to drive them with??
Under driving will allow you to "probably" skip the fan..
Or.. stick one of these in the middle..
http://www.ledgroupbuy.com/ocean-coral-white/


Last edited by jeffkrol; 08-18-2014 at 01:24 AM. Reason: ocw
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post #6 of 12 (permalink) Old 08-18-2014, 05:43 AM Thread Starter
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Originally Posted by jeffkrol View Post
see if you can fit this in..


What are you going to drive them with??
Under driving will allow you to "probably" skip the fan..
Or.. stick one of these in the middle..
http://www.ledgroupbuy.com/ocean-coral-white/

I think i could try to fit like that, as for a driver im thinking to use something maybe like a 20w with some kind of diming
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post #7 of 12 (permalink) Old 08-18-2014, 02:20 PM Thread Starter
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And also for a optics, do i took a good decision to put there a 60 degree optics?
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post #8 of 12 (permalink) Old 08-18-2014, 05:45 PM
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And also for a optics, do i took a good decision to put there a 60 degree optics?
Are you hanging the light high? Because unless you are 60deg is not going to work.
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post #9 of 12 (permalink) Old 08-18-2014, 07:13 PM Thread Starter
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Are you hanging the light high? Because unless you are 60deg is not going to work.
Something maybe a 50 cm from bottom of tank max
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post #10 of 12 (permalink) Old 08-18-2014, 08:22 PM
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I think i could try to fit like that, as for a driver im thinking to use something maybe like a 20w with some kind of diming
I'd suggest a 36V PS and a LDD-H (or HW if you want to hard wire it) in either 500mA (underdrive) or 700ma.. based on not knowing the exact specs
(assuming 3.6v @ 1000mA and underdriving w/ the Meanwell (3V loss) 36v ps is "close")

The Ldd-h uses PWM dimming.. and fairly cheap controllers can be found..
There are "all in one" solutions and of course some chaep "pot dimming" types on fleabay..
You only need 15W or so....... but first figure voltage and amp needs..
The watts follow that..

Interesting little constant current driver ..Uses either pot dimming or 10V signal dimming..
http://data.stuartconnections.com/ob...le?p=11791&f=1

Found the 1A one on fleabay.. still recommend the 700ma one though..

Last edited by jeffkrol; 08-18-2014 at 08:39 PM. Reason: driver
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post #11 of 12 (permalink) Old 08-18-2014, 08:24 PM
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Something maybe a 50 cm from bottom of tank max
I would measure the angle and see the spread. You are risking heavy spotlighting with that narrow of an optic. Usually 90deg is a nice safe angle.
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post #12 of 12 (permalink) Old 08-20-2014, 12:07 PM Thread Starter
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could not find anywhere localy a 90 degree optics also i have at this time a meanwell LPH-18_12 power supply unit, does it could be dimmable?
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