DIY LED build, emitter choice help - The Planted Tank Forum
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post #1 of 19 (permalink) Old 06-15-2019, 11:40 PM Thread Starter
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Lightbulb DIY LED build, emitter choice help

I built an LED array for my marine nano that I want to rebuild for planted. The existing 8 x 3w 6700 and 8 x 3w 10K are not suitable and I want to replace them with lower power and broader spectrum for medium and low light plants

The tank is roughly 16" width x 10" length and about 10" depth from LEDs to the gravel.

I want to reuse the 16" x 10" aluminum heatsink. What new 16 emitters and dimmable driver would be a good choice please? One driver for all or should I run two strings like I did with the marine setup? I'm ok with a soldering iron but not very good at calculating voltages so details if possible please. Thank you!
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post #2 of 19 (permalink) Old 06-16-2019, 02:15 AM
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Your looking at a 7gal tank-ish.
Freshwater light demands aren't nearly as err demanding as salt water.


your 8 6700k diodes would be plenty..
Assuming around 3.7v each putting them in series would give you a total voltage of 29.6v
So 35V power supply.
Add a 700mA Meanwell LDD-HW (or LDD-LW)
And buy a cheap dimmer to hack into..

Actually prob. best to keep strings down to <24V (need to subtract 3V for LDD)
3.7 x 4 = 14.8V So power supply needs to be 17.8V or greater.

So use 2 drivers..
https://www.plantedtank.net/forums/2...mer-ldd-h.html



Or buy something..
https://www.amazon.com/Aquarium-Asta.../dp/B07236CXBQ
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post #3 of 19 (permalink) Old 06-16-2019, 03:07 PM Thread Starter
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Quote:
Originally Posted by jeffkrol View Post
Your looking at a 7gal tank-ish.
Freshwater light demands aren't nearly as err demanding as salt water.


your 8 6700k diodes would be plenty..
Assuming around 3.7v each putting them in series would give you a total voltage of 29.6v
So 35V power supply.
Add a 700mA Meanwell LDD-HW (or LDD-LW)
And buy a cheap dimmer to hack into..

Actually prob. best to keep strings down to <24V (need to subtract 3V for LDD)
3.7 x 4 = 14.8V So power supply needs to be 17.8V or greater.

So use 2 drivers..
https://www.plantedtank.net/forums/2...mer-ldd-h.html



Or buy something..
https://www.amazon.com/Aquarium-Asta.../dp/B07236CXBQ
Thank you for your reply.

It's 12g total water volume including one gallon in the rear compartments.

I think I want more then just whites though. A broader spectrum would be healthier and make the colours pop no? I agree probably eight emitters are enough.
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post #4 of 19 (permalink) Old 06-16-2019, 03:33 PM
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I def. agree you should add more than just the cool whites.
W/ small tanks and custom that's just a matter of throwing more diodes but wasting more potential..

And you sort of have a few options here..
cool white/warm white (adds red)
High cri neutral whites.
Cool white/red blue/(green) combos
like this:
https://www.amazon.com/WOTERZI-Aquar...a-758794806680

On the cheap you could throe a row (3?) of
"Full spectrum" diodes in but make sure they are on their own channel..
Get the star board mounted ones of course..Thewy are sort of everywhere..
https://www.aliexpress.com/item/32530533302.html

Royal blue emitter w/ a broad red phosphor..
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post #5 of 19 (permalink) Old 06-16-2019, 04:26 PM
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Quote:
Originally Posted by jeffkrol View Post
I def. agree you should add more than just the cool whites.
W/ small tanks and custom that's just a matter of throwing more diodes but wasting more potential..

And you sort of have a few options here..
cool white/warm white (adds red)
High cri neutral whites.
Cool white/red blue/(green) combos
like this:
https://www.amazon.com/WOTERZI-Aquar...a-758794806680

On the cheap you could throe a row (3?) of
"Full spectrum" diodes in but make sure they are on their own channel..
Get the star board mounted ones of course..Thewy are sort of everywhere..
https://www.aliexpress.com/item/32530533302.html

Royal blue emitter w/ a broad red phosphor..
I've been wondering since the last time you recommended these.
Wouldn't these full spectrum led's make the tank look too "Magenta"?

Last edited by Quesenek; 06-16-2019 at 05:44 PM. Reason: words
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post #6 of 19 (permalink) Old 06-16-2019, 05:56 PM
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Well.. a matter of opinion, and did recommend dimming so there is that.

Those that built around them usually recommend high k leds (higher than 6500k) to "cut" the tone..

One could throw in a cyan/green to just make a "whitish" color w/ them..

People often prefer either magenta or a crisp blue white (w accented greens if an ADA type person) ..visually.

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post #7 of 19 (permalink) Old 06-16-2019, 06:01 PM
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not exactly related but I was too lazy to make a new post https://www.nature.com/articles/s41377-019-0148-8
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post #8 of 19 (permalink) Old 06-16-2019, 06:20 PM
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Quote:
Originally Posted by jeffkrol View Post
Well.. a matter of opinion, and did recommend dimming so there is that.

Those that built around them usually recommend high k leds (higher than 6500k) to "cut" the tone..

One could throw in a cyan/green to just make a "whitish" color w/ them..

People often prefer either magenta or a crisp blue white (w accented greens if an ADA type person) ..visually.
I might need to do some experimenting with them then.
The magenta color they show in the pictures was a turn off for me, but if I can make a "White" color out of them it might be worth it because of the spectrum they give.

Would you say that the quality of led's from the bay would be good enough for good plant growth? So far I've been using luxeon leds, how much difference have you seen with the cheap diodes versus luxeon?
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post #9 of 19 (permalink) Old 06-16-2019, 07:32 PM
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Full every full spectrum LED I use I pair it with equal wattage 15K LED.
This cuts the magenta away.
I would do a test to how you like the color.

All China for me from the BAY.
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post #10 of 19 (permalink) Old 06-16-2019, 10:56 PM
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Quote:
Originally Posted by Quesenek View Post
I might need to do some experimenting with them then.
The magenta color they show in the pictures was a turn off for me, but if I can make a "White" color out of them it might be worth it because of the spectrum they give.

Would you say that the quality of led's from the bay would be good enough for good plant growth? So far I've been using luxeon leds, how much difference have you seen with the cheap diodes versus luxeon?

Well photons are photons so it only matters on watt efficiency..
quality diodes give you real numbers (sort of) eek bays.. who knows..


Over-watt it and you are fine..


"Old" Bridgelux egg" diodes had an efficiency of like 50 Lumens/Watt
CREE emitters could go as high as 150L/watt..
Of course the "eggs" are like 10 cents each while the Crees, if lucky, were like $3


Then there is color.. Most generic whites are err horrible in my opinion and of course will vary lot per lot (will ALL the other characteristics like efficiency V(f) ect..)


And sometimes you just get a bad batch that fail rapidly..

Estimate on how to turn "full spectrum" white-ish

Quote:
* MIXING LIST
----------------------------------------
myData fullspec2.txt [120°] x1
LED Green (520nm) [120°] x3
----------------------------------------

* SIMULATION DATA
----------------------------------------
Luminous flux : 440 lm
Radiant flux : 2,051 mW
PPF : 8.9 umol/s
TCP : 5990 K
CRI : 91
λp : 448 nm
Color : #FFD5D4
https://www.colorhexa.com/ffd5d4

Quote:
Originally Posted by Wobblebonk View Post
not exactly related but I was too lazy to make a new post https://www.nature.com/articles/s41377-019-0148-8

Thanks.. Why didn't I think about adding cyan... snicker..
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Last edited by Darkblade48; 06-18-2019 at 12:32 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #11 of 19 (permalink) Old 06-17-2019, 03:24 AM
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Quote:
Originally Posted by jeffkrol View Post
Well photons are photons so it only matters on watt efficiency..
quality diodes give you real numbers (sort of) eek bays.. who knows..


Over-watt it and you are fine..


"Old" Bridgelux egg" diodes had an efficiency of like 50 Lumens/Watt
CREE emitters could go as high as 150L/watt..
Of course the "eggs" are like 10 cents each while the Crees, if lucky, were like $3


Then there is color.. Most generic whites are err horrible in my opinion and of course will vary lot per lot (will ALL the other characteristics like efficiency V(f) ect..)


And sometimes you just get a bad batch that fail rapidly..

Estimate on how to turn "full spectrum" white-ish


https://www.colorhexa.com/ffd5d4
Thanks for the information, I'll have to keep this in mind next time I feel like messing around with building another fixture.
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post #12 of 19 (permalink) Old 06-18-2019, 01:26 PM
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I think you should give the good old LM317 a try. They are super cheap, reliable, flexible, and can be very efficient.

https://en.wikipedia.org/wiki/LM317

https://www.mouser.com/ProductDetail...lzmQ6tQy8tM%3D

You just have to setup the circuit as a current regulator, match the added led voltage to be slightly under the power supply voltage, and reference resistors in parallel with switches or a potentiometer for your dimming feature.

The LM317 is super easy to use to drive LED's and is totally worth learning to use if you build your own lights.
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post #13 of 19 (permalink) Old 06-18-2019, 01:32 PM
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Quote:
Originally Posted by TheDukeAnumber1 View Post
I think you should give the good old LM317 a try. They are super cheap, reliable, flexible, and can be very efficient.

https://en.wikipedia.org/wiki/LM317

https://www.mouser.com/ProductDetail...lzmQ6tQy8tM%3D

You just have to setup the circuit as a current regulator, match the added led voltage to be slightly under the power supply voltage, and reference resistors in parallel with switches or a potentiometer for your dimming feature.

The LM317 is a super easy to use to drive LED's and is totally worth learning to use if you build your own lights.

It's a linear regulator..


If V (in) differs signifigantly from V (out) you have a lot of heating to contend with



"I" don't recommend it though the type has been a staple for years..Think Steves uses them and others have DIY'd with them

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post #14 of 19 (permalink) Old 06-18-2019, 01:42 PM
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Quote:
Originally Posted by jeffkrol View Post
It's a linear regulator..

If V (in) differs signifigantly from V (out) you have a lot of heating to contend with

"I" don't recommend it though the type has been a staple for years..Think Steves uses them and others have DIY'd with them



I use them and love them. If V (in) does not significantly differ from V (out) then you practically get the best of all worlds. At the very least it's worth learning and having in your arsenal.
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post #15 of 19 (permalink) Old 06-18-2019, 01:46 PM
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Originally Posted by TheDukeAnumber1 View Post
I use them and love them. If V (in) does not significantly differ from V (out) then you practically get the best of all worlds. At the very least it's worth learning and having in your arsenal.
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