diy led lighting assistance needed - Page 5 - The Planted Tank Forum
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post #61 of 80 (permalink) Old 08-25-2020, 06:39 PM Thread Starter
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ok

those arrived today also . i prefer to start with them, so where it's goes?

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1



Last edited by alfred3; 08-25-2020 at 06:39 PM. Reason: .
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post #62 of 80 (permalink) Old 08-25-2020, 07:15 PM
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ok

those arrived today also . i prefer to start with them, so where it's goes?

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1



Where the TC-421 is (replace it w/ one dimmer)...
REMEMBER do not power it w/ more than 10V.

It is just the Manual version of the TC.

"A man with a watch knows what time it is. A man with two watches is never sure"
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post #63 of 80 (permalink) Old 08-27-2020, 02:38 PM
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Just out of curiosity, do you recall an estimate of what your fist light as well as your more recent lights cost in supplies? I've been interested in building my own lights but don't have a good frame of reference for the total cost
My first build cost about INR 2000 about $25
$10 for LED's
$3 for the driver
$7 for the heat sink
$5 for wires, and thermal paste and miscellaneous items.

Now,

I use Mean well drivers, CREE LED's (I know, but i work with what i can get locally) heat sink like shown below...
I use a PAR meter, so I measure and build exactly what "I" need for the tank. Using good Quality stuff, the price is comparable to the lights available in the store.
How ever the advantage is that you can customize and fix stuff if it breaks.
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post #64 of 80 (permalink) Old 09-03-2020, 04:57 AM
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Quote:
Originally Posted by SirNut View Post
Just out of curiosity, do you recall an estimate of what your fist light as well as your more recent lights cost in supplies? I've been interested in building my own lights but don't have a good frame of reference for the total cost
Just jumping in here to give you a little more frame of reference.
I built my initial light for a 10 gallon and here are the basics to it.

7 luxeon 6500k = $17
3 luxeon 2700k = $8
From StevesLed's.

mean well 1000ma LDD-H driver = $6
48v 75w mean well switching power supply = $14
From LED supply.

Generic PWM dimmer hacked to control the LDD = $7 amazon
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post #65 of 80 (permalink) Old 09-11-2020, 03:08 PM Thread Starter
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the HLG-185H-36AB have a built in dimming option ,do i need to adjust the a or v down a bit before i am connecting it to the ac ?

the cobs are 33.7V and there is 2 options vo adjust and ai adjust

Last edited by alfred3; 09-11-2020 at 03:30 PM. Reason: .
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post #66 of 80 (permalink) Old 09-13-2020, 07:25 AM
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Voltage you can leave alone
The amps, you'll be starting at 5.2A output.
You can connect a 10-100k potentiometer to the dim circuit. Looks like the more resistance the brighter it is. Suppose you could temporarily dim it w/ like a 50k resistor. Effectively limiting average current.
Dialing down the amps (a) does the same thing sort of.
Normally I suppose you would measure the amp output "live" or plugged in, and adjust it.
If you have a 20A setting or so you shouldn't blow your meter.

Just remember in parallel each Cob will get
5.2A divided by the # of cobs you have wired up.

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post #67 of 80 (permalink) Old 09-18-2020, 08:02 PM
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interested in how this build is coming along

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post #68 of 80 (permalink) Old 09-18-2020, 08:52 PM
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Is this what happens when a engineer gets into the hobby and have a few too many hours on his hand

In all seriousness though, very informative DIY post, great stuff you guys got going on, love all the details and schematics y'all posted on this build, totally geeking out right now
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post #69 of 80 (permalink) Old 09-24-2020, 06:32 PM Thread Starter
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And there be light, after some attempts managed to turn on the cobs. What is certain it is dam hot, i really hope that aluminium body will handle the heat. Btw the dimmer that was sugustet is getting very hot allso, can it be that he can't handle the voltage?

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Last edited by alfred3; 09-24-2020 at 06:39 PM. Reason: .
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post #70 of 80 (permalink) Old 09-25-2020, 11:35 AM
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This is awesome. Great input by all. I plan to do a 125gallon Tall soon, so lots of info to digest here.
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post #71 of 80 (permalink) Old 09-27-2020, 04:06 AM
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Quote:
Originally Posted by alfred3 View Post
And there be light, after some attempts managed to turn on the cobs. What is certain it is dam hot, i really hope that aluminium body will handle the heat. Btw the dimmer that was sugustet is getting very hot allso, can it be that he can't handle the voltage?

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

suppose I should have mentioned not to run the COB's w/out being attached to a heat sink.. Even 3W "stars" can get blistering hot at power..
and you need ALL the parallel cobs hooked up or you will overpower them.


Dimmer shouldn't be getting too hot. The Dim circuit 1)doesn't draw much current AFAICT and 2) It's pwm so off/on

Quote:
Dimming source current from power supply: 100microamps typ.
you have it on it's own 10v source right?

You can use a resistor between the dim wires instead: 10KOhms= 10% 20 KOhms = 20% 100KOhms = 100% Don't go below 10KOhms.




Only thing to heat up in the dimmer is that MOSFET (ignore the orange wire, that's an added 5V "tap" for LDD dimming)..
Well and the tiny voltage regulator that shifts the 10V (or 12-24V normally) to 5V for the timing IC circuit .
Neither of which should be "stressed" at 10V.

"A man with a watch knows what time it is. A man with two watches is never sure"

Last edited by jeffkrol; 09-27-2020 at 04:31 AM. Reason: edit
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post #72 of 80 (permalink) Old 09-29-2020, 08:51 PM Thread Starter
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OK

connected the cobs to the aluminium body with thermal tape and connected the dimmer (workes well ).

after about 20-30 min the cobs temp reached approx 60-62 celsius. i is it an ideal temp or to hot ( it going to work 8 hours a day ) the other option it colling by a fan. is it better big fans on top of the aluminium body or small fans inside near the cobs?
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post #73 of 80 (permalink) Old 09-29-2020, 09:24 PM
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OK

connected the cobs to the aluminium body with thermal tape and connected the dimmer (works well ).

after about 20-30 min the cobs temp reached approx 60-62 celsius. i is it an ideal temp or to hot ( it going to work 8 hours a day ) the other option it cooling by a fan. is it better big fans on top of the aluminium body or small fans inside near the cobs?

60 C is a bit warm.. 50C is usually my "comfort zone" on heat sink temps.
Actual COB temps will be much higher..

good thing is you got heat transfer..


W/ LED's cooler is always better regardless

You need to move heat off the aluminum so fans on top or blowing across fins is the best..
Don't need big fans.. just need some air movement across the fins

"A man with a watch knows what time it is. A man with two watches is never sure"
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post #74 of 80 (permalink) Old 09-30-2020, 03:38 AM Thread Starter
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Thanks jeff
Here some pic of the final thing
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post #75 of 80 (permalink) Old 09-30-2020, 07:34 AM
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is that the maker slim housing as your heatsink? its hard to tell from the really bright light It looks great.

Last edited by bubbaray_00; 09-30-2020 at 07:41 AM. Reason: typo
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