RGBW diodes testing - The Planted Tank Forum
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post #1 of 4 (permalink) Old 09-28-2018, 12:47 AM Thread Starter
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RGBW diodes testing

About to get back into the hobby after a long hiatus

Project #1 -- a bookshelf tank that uses 3W-8 pin RGBW diodes -- really, I want to see if I can eventually get LEDs to replicate the super saturated colors of the old ge aquarays and how intense I can get the lighting

Anyone ever try this?

I'm planning either a low light shrimp tank w/ moss carpet or a small betta tank w/ a moss patch and a terrestrial plant suspended at the top (likely a peace lily)...but am curious if these little lights can get to med-high / high light over a small tank


So far, I have found these:

https://www.amazon.com/Led-World-Pow...N2N83JTTCV21FK

...are there any other, higher quality ones out there?

in a perfect world, there would be 2 RGBWs (2700k and 6500k whites + the same RGB)

If not, I will likely start in 2ish weeks


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post #2 of 4 (permalink) Old 09-28-2018, 02:30 AM
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GE9325
cri 67

try this:
Quote:
* MIXING LIST
----------------------------------------
LED RoyalBlue (450nm) [120] x1
LED Blue (480nm) [120] x1
LED Cyan (490nm) [120] x1
LED Green (540nm) [120] x1
LED Amber (590nm) [120] x1
LED Red (620nm) [120] x4
----------------------------------------

* SIMULATION DATA
----------------------------------------
Luminous flux : 502 lm
Radiant flux : 2,095 mW
PPF : 9.6 umol/s
TCP : 10750 K
CRI : 76
λp : 623 nm
Color : #FF5A9D
------------------------------
----------
or this:
Quote:
* MIXING LIST
----------------------------------------
LED UV (410nm) [120] x1
LED RoyalBlue (450nm) [120] x1
LED Blue (480nm) [120] x1
LED Cyan (490nm) [120] x2
LED Green (540nm) [120] x1
LED Amber (590nm) [120] x1
LED Red (620nm) [120] x4
----------------------------------------

* SIMULATION DATA
----------------------------------------
Luminous flux : 552 lm
Radiant flux : 2,718 mW
PPF : 11.8 umol/s
TCP : 13330 K
CRI : 68
λp : 623 nm
Color : #FF68BE
Was keeping it in the Kelvin range..
I've changed my thinking a bit from here:
https://www.plantedtank.net/forums/1...quivalent.html

If you actually want to match the GE this is th differences using "standard" RGB diodes:
Blue is too high in nm.. Royal blue is a better match though some "violets" are even a bit better. 435nm..
Need some blue and cyan
GE ha a small spike in amber.. also missing in the LED's
and no violet of any kind.. need a smidge of 405-ish

your RGB +W can come close but, frankly, probably noticeable differences..
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Last edited by jeffkrol; 09-28-2018 at 04:13 AM. Reason: edit
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post #3 of 4 (permalink) Old 09-28-2018, 08:30 AM Thread Starter
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thanks for the response

so you think the human eye distinguish the small differences in wavelength -- as in it would be enough to matter:
i.e. 520nm vs 540nm for green or 40nm vs 480nm for blue? etc.

more importantly...do any of the quality manufacturers make similar diodes that arent $15/ea?


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Last edited by Optix; 09-28-2018 at 10:55 AM. Reason: comprehension and I exaggerate
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post #4 of 4 (permalink) Old 09-28-2018, 06:41 PM
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Buy your LEDs premounted, and you will notice less selection... But it will rarely be all that expensive. Maybe ~5$ each? StevesLEDS, RapidLED, LEDgroupBuy are the big ones, with Steve's being my favorite. Otherwise you may have to buy in bulk to get uncommon wavelengths or bins, places like DigiKey or Mouser sell almost everything unmounted that Cree, LumiLEDs etc produce.


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