DIY - Custom LED Hood for 125g tall planted tank - The Planted Tank Forum
 2Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 (permalink) Old 09-28-2020, 04:33 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Jun 2020
Posts: 19
DIY - Custom LED Hood for 125g tall planted tank

Hi all,
I have been lurking for over a decade. I did a custom planted tank hood 12 or so years ago with T5 bulbs. With the extra at home time with Covid19, I decided to recommission my 125g Tall tank from the garage and build a custom stand. I started this tank with organic soil, capped with black beauty and a dry start method. I bought some 100wLED flood lights from Amazon but have had little success growing a carpet of monte carlo. So long story short, I have decided (with the urging of this community) to do a custom LED light fixture. I think I will do a custom hood too so here are some details on my thoughts.

Tank Size
60" wide, 18" depth, 26" Tall

Parts
Heatsink - 1/16" 18"*60" Aluminum
LED's - ‎ Bridgelux V13C THRIVE 976-BXRE-65S2001-C-74-ND‎ (12), Bridgelux V10C Thrive BXRE-50S1001-C-74 (6)
Controller - TC421 - WIFI Controller with LDD-350LW to drop the voltage from the power supply to 12v.
Power Supply - Meanwell 36v AC/DC Converter LRS-350-36
Drivers - LED Driver Meanwell LDD-1000HW (3) 6 led's per driver

Example Wiring diagram (Note - I will use 6 led's per driver)


My Tank
Click image for larger version

Name:	20200924_073016.jpg
Views:	42
Size:	130.1 KB
ID:	903479

My question(s)
Does this selection make sense?
Will the 1/16 aluminum sheet be enough as a heatsink?
Any concerns, or suggestions?

Thanks everyone

Last edited by bubbaray_00; 09-29-2020 at 02:38 PM. Reason: Changed 200w to 100W
bubbaray_00 is online now  
Sponsored Links
Advertisement
 
post #2 of 23 (permalink) Old 09-29-2020, 01:03 AM
Planted Tank Guru
 
PTrader: (0/0%)
Join Date: Jun 2013
Location: WI
Posts: 12,121
You need 1 driver per COB
36V is borderline for the COBs as well considering you "lose" 2-4V in translation..
36V plus LDD means 32-34V out max.
Typical V(f) of V10 is 34.4V


Two COBs in series would require 68.8V out
Two in parallel cuts the driver current in 1/2..
Actually doesn't hurt but you likely won't get the expected output..


As to 1/16 al plate.. ????
Your talking about dissipating over 500W of heat
1A x 34V x 18 COBs ...

"A man with a watch knows what time it is. A man with two watches is never sure"
jeffkrol is online now  
post #3 of 23 (permalink) Old 09-29-2020, 04:28 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Jun 2020
Posts: 19
Lightbulb

So let me take a step back, I think I offered a solution instead a problem to a forum with experts. The 2 100w Flood lights didn't cut it, and forum members suggested a DIY LED solution. Reading this thread I extrapolated his solution for a 80gallon tank as a primer for mine (made mine 50% bigger due to bigger tank). So the problem I am trying to solve is growing plants in my 125g Tall tank. I feel like I don't have adequate coverage, and proper lighting intensity at the substrate. I was shooting for a solution that handled both of these problems with roughly 250w. I was expecting to run these LED's at 1/2 of their maximum to try to extend their life and not generate too much heat.

So to address your points.

1. 36v powersupply. This was a mistake. I changed my plan to Meanwell 48v AC/DC Converter LRS-350-48. Thanks for that catch.
2. One Driver per COB. Is this a hard requirement, or a suggestion for a nube so I don't electrocute me and my fish? This design adds lots of cost, and I was trying to trade off flexibility for cost. Can I not combine multiple COB's into a circuit (Parallel/Series) and save the number of drivers?
3. Heatsink - going back to the other DIY thread, I see calculations of 6 to 20Sq inches of radiator per watt. Do you have any advice on this? I see lots of heatsink options on Aliexpress. Makes me wonder if anyone has made a water cooler for their lights to heat their fishtank

Many Thanks.

Last edited by bubbaray_00; 09-29-2020 at 08:47 PM. Reason: Circuit and water cooling
bubbaray_00 is online now  
 
post #4 of 23 (permalink) Old 09-29-2020, 06:33 PM
Wannabe Guru
 
monkeyruler90's Avatar
 
PTrader: (74/100%)
Join Date: Apr 2008
Location: San Diego, Ca
Posts: 1,953
Send a message via AIM to monkeyruler90
I think 1/16" is too thin. I have 1/4"x36"x2.5" 6063 bars for my LEDs and they get hot to the touch. I think running that many COBs on that thin of a plate won't evenly distribute the heat.

People say that the LEDs can run hotter however I like to keep mine cooled with the thought that it will extend their life.

--Oscar.
Fluval pimp #4 aka PIMP master!
I SAID ITS GREAT
TO BE

A FLORIDA GATOR!!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
monkeyruler90 is offline  
post #5 of 23 (permalink) Old 09-29-2020, 07:36 PM
Planted Tank Enthusiast
 
PTrader: (1/100%)
Join Date: Sep 2008
Location: Palm Bay
Posts: 622
2.079" extruded alluminum. 3x 60" bars spread out over the width of the tank front to back, then spread out the 9 cobs for each side evenly among the bars directly in the center of each bar front to back.

You'll also want active cooling blowing across the heatsinks.
Quesenek is offline  
post #6 of 23 (permalink) Old 09-29-2020, 08:04 PM
Planted Tank Guru
 
PTrader: (0/0%)
Join Date: Jun 2013
Location: WI
Posts: 12,121
The one driver per cob is an electrical parameter " partly".
Like I mentioned you can run multiple cobs per driver IF you understand the limitations.
Current divides in parallel.
Soo say you have 1 1000mA driver and 3 parallel cobs hooked to it each only is run at 1/3 of 1000mA.


You gain a little output since the less current the more efficient the cobs run but, obviously not equal to 3 Cobs at 1000mA each.

Next is imbalance. Running multiple cobs/ leds in parallel gas some issues in actual equally sharing as in sometimes they don't and "experts" usually compensate w/ added circuitry.

Third is what happens when one cob dies.
Current us re- shared amongst the remaining
Cobs/diode strings
Example of worst case would be 2 cobs parallel to a 2000mA driver,
While working each parallels cob gets 1000mA. If one fails open remaining one gets all 2000mA possibly killing or damaging the remaining one.
Easy and cheap to fuse each w/ like a 1.25A fuse as a precaution.

"A man with a watch knows what time it is. A man with two watches is never sure"
jeffkrol is online now  
post #7 of 23 (permalink) Old 09-29-2020, 08:58 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Jun 2020
Posts: 19
Quote:
Originally Posted by Quesenek View Post
2.079" extruded alluminum. 3x 60" bars spread out over the width of the tank front to back, then spread out the 9 cobs for each side evenly among the bars directly in the center of each bar front to back.

You'll also want active cooling blowing across the heatsinks.
Great suggestion, I was searching on Aliexpress and was getting frustrated. These will work perfectly, and at a reasonable price. I do find it funny that with this suggestion I would actively cool, within inches of 2 heaters active heating the water. Seems like an opportunity waiting to be designed (not by me )
bubbaray_00 is online now  
post #8 of 23 (permalink) Old 09-29-2020, 11:22 PM
Planted Tank Guru
 
PTrader: (0/0%)
Join Date: Jun 2013
Location: WI
Posts: 12,121
No need for fans..
$10..sometimes.

"A man with a watch knows what time it is. A man with two watches is never sure"
jeffkrol is online now  
post #9 of 23 (permalink) Old 09-30-2020, 12:42 AM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Jun 2020
Posts: 19
8.04 each

https://www.newark.com/wakefield-sol...rmalManagement

Free shipping over $150 too.

is this the right thing?
bubbaray_00 is online now  
post #10 of 23 (permalink) Old 09-30-2020, 01:14 AM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Jun 2020
Posts: 19
has anyone ever tried a custom water loop for cooling these? Use copper water cooling blocks like these connected together. Water comes from tank routes through blocks, and returns to tank. If needed a radiator can be added so you don't boil your fish.
bubbaray_00 is online now  
post #11 of 23 (permalink) Old 09-30-2020, 03:11 AM
Planted Tank Guru
 
PTrader: (0/0%)
Join Date: Jun 2013
Location: WI
Posts: 12,121
Quote:
Originally Posted by bubbaray_00 View Post
8.04 each

https://www.newark.com/wakefield-sol...rmalManagement

Free shipping over $150 too.

is this the right thing?

Well the ones I showed were to passively cool Xeon processors and more like 3x3x1"
SNK-P0028P


If I read this right pack of 4 for $36 but I'd check.
Welcome to NextWarehouse.com


Bit overkill but I had fun sliding them around my 55 after I attached legs.
Welcome to NextWarehouse.com


Either their weights off or my scale sucks.. I'd bet on the scale..
Shipping looks to be free..

LDD-hw would thermal glue to the side perfectly.
Small lip and height is below top of fins..
Quesenek likes this.

"A man with a watch knows what time it is. A man with two watches is never sure"
jeffkrol is online now  
post #12 of 23 (permalink) Old 09-30-2020, 06:23 AM
Planted Tank Enthusiast
 
PTrader: (1/100%)
Join Date: Sep 2008
Location: Palm Bay
Posts: 622
Quote:
Originally Posted by jeffkrol View Post
Well the ones I showed were to passively cool Xeon processors and more like 3x3x1"
SNK-P0028P


If I read this right pack of 4 for $36 but I'd check.
Welcome to NextWarehouse.com


Bit overkill but I had fun sliding them around my 55 after I attached legs.
Welcome to NextWarehouse.com


Either their weights off or my scale sucks.. I'd bet on the scale..
Shipping looks to be free..

LDD-hw would thermal glue to the side perfectly.
Small lip and height is below top of fins..
3x3x1 is a really nice dimension for a DIY pendant type, not that tall.
Say there was a fan on top cooling the fins, how many COB's could each handle?
For instance the COB's in this thread, running at 500 mA to extend diode life, could you run just one COB or multiple COB's per heatsink.
Quesenek is offline  
post #13 of 23 (permalink) Old 09-30-2020, 07:54 AM
Planted Tank Guru
 
PTrader: (0/0%)
Join Date: Jun 2013
Location: WI
Posts: 12,121
Quote:
Originally Posted by Quesenek View Post
3x3x1 is a really nice dimension for a DIY pendant type, not that tall.
Say there was a fan on top cooling the fins, how many COB's could each handle?
For instance the COB's in this thread, running at 500 mA to extend diode life, could you run just one COB or multiple COB's per heatsink.
I've only used 1cob 1hs.
It's fairly easy getting on to hit 110F on a sinble COB..


As an odd side note it was easy (I ran current adj. drivers btw, normally around 500mA) to get really hot heat sinks w/ the SORRA chip.
Think there was a combination of lower conversion to light efficiency of the violet (as opposed to blue) pump and they look to use pure aluminum

plates on their COB's (guess by looking at them) so heating and transfer was quite efficient.


Like I mentioned pretty sure they were rated for 35W so as a guess 2 cobs driven at 500mA would be about 35W..
W/ fans easy w/ 2 cobs.

As much as I dislike them, no denying they cool things quite well.





https://www.edn.com/cooling-high-pow...ssive-methods/


Quote:
Figure 2 This shows a 2.3″2.4″1.4″ fine-pitch extruded heat sink, with a 50 watt Bridgelux LED array. With no air flow, this has a thermal resistance of 4 C/W, meaning it can handle only about 10 watts. When a low-speed fan is added to it as shown in the upper view, it exhibits a thermal resistance of only 0.8 C/W, increasing its power capability to over 50 watts – a five times improvement! (Photo courtesy of Nutron Mfg Inc.)
why copper you might ask.. because I can't afford diamond..


https://www.ledinside.com/knowledge/...gines_20120308
Quesenek likes this.

"A man with a watch knows what time it is. A man with two watches is never sure"
jeffkrol is online now  
post #14 of 23 (permalink) Old 09-30-2020, 08:36 PM
Planted Tank Guru
 
PTrader: (0/0%)
Join Date: Jun 2013
Location: WI
Posts: 12,121
For fun and since I was "playing" w/ my SORRA light source I thought I'd measure the copper/puck heat.
As expected from before.. at 700mA the heat sink hit 126F (52C).
Face was about 172F(77C) (cob face).

Could go as high as 192F..

Now you know why I'd never run this part COB at more than 500mA


Soo consider that..
29.7 V(f) at 700mA is 20.79W

Going down to 60% dim approx temp at the cob face dropped to 110F, back remained the same.

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

Last edited by jeffkrol; 09-30-2020 at 09:02 PM. Reason: edit
jeffkrol is online now  
post #15 of 23 (permalink) Old 09-30-2020, 10:32 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Jun 2020
Posts: 19
Are these measures passively cooled or active?

Sent from my SM-G970U using Tapatalk
bubbaray_00 is online now  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome