DIY - Custom LED Hood for 125g tall planted tank - Page 2 - The Planted Tank Forum
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post #16 of 23 (permalink) Old 09-30-2020, 10:45 PM
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Originally Posted by bubbaray_00 View Post
Are these measures passively cooled or active?

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Passive..

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post #17 of 23 (permalink) Old 10-01-2020, 12:27 PM Thread Starter
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Looking back at your example of this Heatsink and Cob installed what size light is that (I am assuming similar to the v10). I wonder if the size of the "chip" is a limiting factor of the heat issue. Xeon chips have a much higher TDP than 35w, but also have a much larger surface area and might have better cooling properties (probably not since Intel). I would think the larger chips v13, v20 would fair better in heat dissipation assuming the same wattage.

Last edited by bubbaray_00; 10-01-2020 at 01:57 PM. Reason: Duped
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post #18 of 23 (permalink) Old 10-01-2020, 02:44 PM Thread Starter
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So I am leaning towards a Pendant setup again. My wife has some design input as this is our living room, and she does have a better eye for form than I do. I am the function guy. So I did a quick sketchup and was thinking something like this Click image for larger version

Name:	Fishtank Pendant 10 lights.jpg
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It would be optimal to use a single COB per pendant. Is the Vesta tunable a viable option ?https://bridgelux.com/sites/default/...%20Rev%20F.pdf

I am assuming I can adjust the height above the tank to get the right coverage, and use the TC421 to adjust color and intensity (dimming). I really would like to passive cool as this is my living room, and our main movie/tv watching area. If these xeon coolers aren't the right one maybe something purposefully built.
Anyone have experience with FrigoDynamics? They have some great looking products but I bet they are really expensive. http://www.frigodynamics.com/images/...idgelux_EN.pdf


This is one of the deepest, but most rewarding rabbit holes I have fallen in for a long time, so I thank everyone here for the much needed diversion.

Last edited by bubbaray_00; 10-01-2020 at 05:06 PM. Reason: typo
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post #19 of 23 (permalink) Old 10-01-2020, 05:22 PM
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Originally Posted by bubbaray_00 View Post
So I am leaning towards a Pendant setup again. My wife has some design input as this is our living room, and she does have a better eye for form than I do. I am the function guy. So I did a quick sketchup and was thinking something like this Attachment 903605.
It would be optimal to use a single COB per pendant. Is the Vesta tunable a viable option ?https://bridgelux.com/sites/default/...%20Rev%20F.pdf

I am assuming I can adjust the height above the tank to get the right coverage, and use the TC421 to adjust color and intensity (dimming). I really would like to passive cool as this is my living room, and our main movie/tv watching area. If these xeon coolers aren't the right one maybe something purposefully built.
Anyone have experience with FrigoDynamics? They have some great looking products but I bet they are really expensive. http://www.frigodynamics.com/images/...idgelux_EN.pdf


This is one of the deepest, but most rewarding rabbit holes I have fallen in for a long time, so I thank everyone here for the much needed diversion.
Bare COBS higher than 5" off the water line start to flood the room more than the tank so, now you are talking bout lenses..
Suggest reflectors, angle will depend on height.


Tune-able COBS are fine.


Gets a bit difficult on how one "tunes" them though..
Quote:
Maximum Drive Current is maximum combined drive currents between both 2700K and 6500K channels. For example, if 700mA is applied to the 2700K channel, no current may be applied to the 6500K channel of the array. If 350mA is applied to the 2700K channel, then a maximum of 350mA can be applied to the 6500K channel.
Gets a bit tricky if you don't use a specialty 2 channel driver .
you can use 2 350mA drivers to run one COB to keep within the guidelines.
Thing is if you like a "white" (6500k) tank most of the time you "waste" 1/2 the COB.
Using the 350mA as a baseline and what one would run the 6500k at (or a small % of 2700K)
you min # of COBs is 10..to meet the "minimum wattage"
At 350 and ONLY 6500k channel est output is 80% of test sooo 129L/W x .8 x 12W X 10 chips = 12384 Lumens
Of course just a subset of "PAR"

Now much depends on what your preferred look is. From guessing "popular opinion" most prefer a white(or blue white) white over a yellow white so that i why arrays usually run at least 2:1 cool vs warm white
YMMV



You know as a starting point you only need about 120W of leds over that tank.
Adding more COB's at lower drive currents and smaller heatsinks is prob a wash over adding fewer cobs at higher drive current, and larger heat sinks

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Last edited by jeffkrol; 10-01-2020 at 05:51 PM. Reason: edit
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post #20 of 23 (permalink) Old 10-01-2020, 06:54 PM Thread Starter
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I was aiming for a lower count of COB's since the Pendant style looks better that way. It was after I posted this previous message, that I looked closer at the data sheet of the Vesta COB's and noticed the Dual inputs, so basically a 1 to 1 ratio since both sides can take 350ma. I assumed there was some type of unicorn magic that made it infinitely flexible.

Would one warm white COB in the center 2 pendant positions with all other outer pendants using cool whites be enough? I figured I can raise those two pendants up to get bit wider coverage and push them harder to make up for any deficiencies if necessary.

As for the height over the tank, I am totally open to keeping pendants as low as necessary, just so that I have adequate coverage with minimal spill over (still talking about a living room here) I am good.

Thanks again for all your expert input. I am totally in uncharted waters for me, so I appreciate the guidance.

Last edited by bubbaray_00; 10-01-2020 at 07:25 PM. Reason: Unicorns
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post #21 of 23 (permalink) Old 10-01-2020, 08:44 PM
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Well they are infinitely flexible.
700,0
350,350
0,700 and an infinite of in- betweens. :

Problems would come in if one didn't
pay attention when using 2 drivers @ 700 mA and crank them both to 11.
.
You can get special drivers.
https://ltftechnology.com/dual-chann...or-cct-tuning/

This isn't very commonly used in diy
but doesn't mean it won't work well.

Be the first..<a href="https://www.plantedtank.net/forums/images/smilie/icon_smile.gif" border="0" alt="" title="Smile" >:-)</a>

Drivers are bulky and expensive relatively speaking.

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post #22 of 23 (permalink) Old 10-01-2020, 08:56 PM
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2 rows of 5 cobs 3cw 2ww will work fine.
Your current design has a pretty intense center hot spot.

Can even use smaller cheaper warm whites.

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post #23 of 23 (permalink) Old 10-01-2020, 09:15 PM Thread Starter
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I was thinking 4cw, 1 ww per side. (so 8cw and 2ww total). Keeping the ww's in the Center spots on each side (labeled purple below).
Click image for larger version

Name:	Fishtank Pendant 10 lights.jpg
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I do see what your saying that the center of the tank will be a lava zone. Might have to dim those respective to the outer lights. I think I have 5 channels on the TC421, I assume I can combine lights in groups to control (Outer CW, Inner CW, WW for example). Is that a correct assumption?

Last edited by bubbaray_00; 10-02-2020 at 12:57 AM. Reason: typo
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