A couple questions concerning an LED build - The Planted Tank Forum
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post #1 of 7 (permalink) Old 01-11-2017, 06:16 PM Thread Starter
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Question A couple questions concerning an LED build

Good evening everyone!

I'm heading towards the final stages of planning my future DIY led build and I needed some help finalizing some things.

First question I have is about optics. According to the spectra chart I can achieve my ideal PAR at 10", my tank is a 20g long so the height is 12" minus 2 due to substrate.

Quote:
* MIXING LIST
----------------------------------------
LED Violet (420nm) x2
PhilipsLumileds Luxeon-Rebel Green (520-540nm) x1
PhilipsLumileds Luxeon-Rebel CoolWhite (4500-10000K) x4
PhilipsLumileds Luxeon-Rebel 4000K (3710-4260K) x4
----------------------------------------

* SIMULATION DATA
----------------------------------------
Luminous flux : 1,444 lm
Radiant flux : 5,073 mW
PPF : 21.8 umol/s
TCP : 6130 K
CRI : 88
λp : 443 nm
Color : #FFF3EB
----------------------------------------

* PERFORMANCE @ 25cm & 110 (compulsory)
----------------------------------------
Irradiance : 12.7 W/m/s
Illuminance : 3,606 lx
PPFD : 54.5 umol/m/s

----------------------------------------

by SPECTRA 1.0β @ 1.023world
SPECTRA
The issue here is that it would only work at 110 optics. Should the optics be so wide? Or should I go to the more focused optics such as 40 or 60. The fixture itself will be on the tank, I do not plan on hanging it.

My second question would be, has anyone used Violet LEDs in their build before? Specifically non UV 420nm kind? Is violet even needed in freshwater planted tanks? I only ask because I've been recently playing around with spectra and ended up getting a really good (I believe) color spectrum going, shown below. Should I add some reds for the sake of the plants? Or will this spectrum work out well i.e. not a major algae grower (despite my title )

Any and all suggestions/advice/experiences are welcomed! Thanks in advance!
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post #2 of 7 (permalink) Old 01-11-2017, 07:03 PM
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Use "native" optics.. i.e what is attached to the diode..
As 2 violets..personal choice. Arguably better off w/ blue.. not RB.. blue.
Skip the green (always skip the green.. ) Use cyan instead.
See the BIG dip above...

Adding 660nm red is OK but not totally necessary. Usually would in larger builds w/ more diodes and channels..
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post #3 of 7 (permalink) Old 01-12-2017, 04:37 AM Thread Starter
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Cool! Actually part of the colors used is cyan, no green! And its just thr one diode at of all the others. That and the violet were sort of taking any blue diodes place.

Other plus is that the native lights use 120 so it won't be too much to have to work around.

Should I just use cyan for night lights? Or would cyan be useful for normal daytime lights with the cw and ww?

I'm just about to head to head to work but I'll definitely change up the mixing list once I get home.

Quote:
Originally Posted by jeffkrol View Post
Use "native" optics.. i.e what is attached to the diode..
As 2 violets..personal choice. Arguably better off w/ blue.. not RB.. blue.
Skip the green (always skip the green.. ) Use cyan instead.
See the BIG dip above...

Adding 660nm red is OK but not totally necessary. Usually would in larger builds w/ more diodes and channels..
Hmm seems to achieve the same thing minus the violets and adding the blues would be by going with the XP-G.

Quote:
* MIXING LIST
----------------------------------------
Cree XP-G CoolWhite (5000-10000K) x7
Cree XP-G WarmWhite (2600-3700K) x8
Cree XP-E Blue (465-485nm) x2
PhilipsLumileds Luxeon-Rebel Cyan (490-510nm) x1
----------------------------------------

* SIMULATION DATA
----------------------------------------
Luminous flux : 2,041 lm
Radiant flux : 6,899 mW
PPF : 30.7 umol/s
TCP : 6020 K
CRI : 88
λp : 453 nm
Color : #FFF7E6
----------------------------------------

* PERFORMANCE @ 25cm & 120 (compulsory)
----------------------------------------
Irradiance : 11.7 W/m/s
Illuminance : 3,465 lx
PPFD : 52.1 umol/m/s
----------------------------------------

by SPECTRA 1.0β @ 1.023world
SPECTRA
The only issue I have with this is that spectra seems to be a little outdated as to the fact that its hard to find XP-Gs nowadays due to the latest and greatest XP-G2. Now the G2 of course is almost double the lm output as the old and what I assume to be different in CRI (being updated and what not). This will make the readings off as to what sort of PAR I will be getting at 25cm. Now the Rebel ES specs. are the same as shown in spectra, so I feel like it's a bit more reliable as to what I will actually be getting in regards to the color combinations.

The other problem is, if I stick with the original Rebel ES diodes but change 2 violets to 1 blue (4 CW, 3 WW, 1 Cyan, and just 1 Blue) I get a spectrum graph as shown below.

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The Kelvin I am aiming for would be for towards the warmer side. So 6500K and below. By trying to turn that 16670k to 6500k would not only mean more diodes than I think are needed for my build, but also costly!

Last edited by Darkblade48; 01-12-2017 at 11:06 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #4 of 7 (permalink) Old 01-12-2017, 05:47 AM
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12-1
13-1
18-1
19-6
26-9

7350K because of the blue.Drops to like 4300 w/out it.
92CRI
As usual still miss all the purple peaks.

19-2
26-13
will go to 6760 and 94cri

luxeon number and count

would work for pucks
Quote:
* MIXING LIST
----------------------------------------
PhilipsLumileds Luxeon-Rebel Blue (460-480nm) [120] x1
PhilipsLumileds Luxeon-Rebel Cyan (490-510nm) [120] x1
PhilipsLumileds Luxeon-Rebel DeepRed (650-670nm) [120] x1
PhilipsLumileds Luxeon-Rebel CoolWhite (4500-10000K) [120] x3
PhilipsLumileds Luxeon-Rebel 2700K (2580-2870K) [120] x12
----------------------------------------

* SIMULATION DATA
----------------------------------------
Luminous flux : 2,273 lm
Radiant flux : 10,032 mW
PPF : 45.1 umol/s
TCP : 6900 K
CRI : 95
λp : 659 nm
Color : #FFA5C1
----------------------------------------

* PERFORMANCE @ 30cm
----------------------------------------
Irradiance : 11.8 W/m/s
Illuminance : 2,679 lx
PPFD : 53.2 umol/m/s
----------------------------------------

by SPECTRA 1.0β @ 1.023world
http://spectra.1023world.net/
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Last edited by jeffkrol; 01-12-2017 at 02:14 PM. Reason: edit
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post #5 of 7 (permalink) Old 01-12-2017, 02:49 PM Thread Starter
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Quote:
Originally Posted by jeffkrol View Post
12-1
13-1
18-1
19-6
26-9

7350K because of the blue.Drops to like 4300 w/out it.
92CRI
As usual still miss all the purple peaks.

19-2
26-13
will go to 6760 and 94cri

luxeon number and count

would work for pucks
Isn't the little square in the upper left corner, the color of the light as perceived by us? If so that's far to pink! And then lowering the WW changes it to practically purple!

As for drivers. Would two LDDs (one for day the other nigh) workout? Since the max current for the luxeons are 1000mA should I get them in 1000mA or give them breathing space with a 700mA?

Thanks so much for all your help by the way.
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post #6 of 7 (permalink) Old 01-12-2017, 03:24 PM
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Take out all the colored, just leaving whites.. square is not white or even yellow white.. Not sure about the square..
W/ a 92CRI based on daylight and daylight K, can't see it being toned "that" much..
Color may be there.. intensity of color is questionable..
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post #7 of 7 (permalink) Old 01-12-2017, 07:22 PM Thread Starter
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Quote:
Originally Posted by jeffkrol View Post
Take out all the colored, just leaving whites.. square is not white or even yellow white.. Not sure about the square..
W/ a 92CRI based on daylight and daylight K, can't see it being toned "that" much..
Color may be there.. intensity of color is questionable..
If anything I'll just order the diodes and amount based off your mixing list:

Quote:
* MIXING LIST
----------------------------------------
PhilipsLumileds Luxeon-Rebel Blue (460-480nm) [120] x1
PhilipsLumileds Luxeon-Rebel Cyan (490-510nm) [120] x1
PhilipsLumileds Luxeon-Rebel DeepRed (650-670nm) [120] x1
PhilipsLumileds Luxeon-Rebel CoolWhite (4500-10000K) [120] x3
PhilipsLumileds Luxeon-Rebel 2700K (2580-2870K) [120] x12
I could also always use a typhoon controller or the tc420 and add the RGBs to a separate channel to mess with intensity....

But now I at least know I'm in the right direction.

As for the drivers, I'll figure that out when I get to it especially since it will be a lot easier to troubleshoot once I get an idea with what I am working with.
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