12х LED assembly for reef tank v4.4R
Version 4.4R Product code: 12xV4.4R

The 12xV4.1R LED assembly is an economy light source for your reef tank. Its creation was the outcome of years of research, as outlined in our article
Light in the Reef Aquaria


Availability:  Out of Stock

The new LED assembly is now completed and ready for sale. The pictures of the installed LEDs will be available after the Chinese New Year holidays, i.e. after 9 February 2017.

Differences from Rev. 12xV4.3R
1. The Neutral White LEDs now gets a separate control channel. Thus, more precision control of the critically important part of the spectrum is now available. Also the LED assembly now has 7-channels.  
2. The Violet channel now consists of 3 different LED types. This change extends the spectrum coverage much more. 
3. The true Blue LED is installed now. The dominant wavelength of this LED is 475-480 nm.
4.  The Blue and the Turquoise LEDs are now covered by the newest Luxeon C color. Please find out more details in a datasheet to the LED assembly description.
5. The MCPCB now has a better thermal conductivity.
6. We use the immersion gold-plating of the pads MCPCB with chemically precipitated nickel sublayer (ENIG) this helps to provide the best quality and reliability of the soldering.  
7. The most stable against UV radiation solder mask Taiyo PSR-4000 LEW7S with best whiteness.
8. Now we use 8-pin connector to make connecting easier and more reliable. 
Despite to all the technical improvements - the price remains the same!
Color Connectors
of chain of
Max. current Max. voltage
on the chain
Wavelength /
Color temperature
LED emitter type
Neutral white X2 pin1 -> X1 pin8 1000ma 3.6V CCT:3700-4300K C3535L-N1L1-A1G11H, 122lm up @ 350mA
Red X2 pin2 ->
X1 pin7
700ma 2.6V 620-630nm C3535M-RNL1-E1H11N, 51.7lm up @ 350mA
Turquoise X2 pin3 ->
X1 pin6
1000ma 3.0V 496-500nm Luxeon C L1C1-CYN1000000000, L20
Not connected X2 pin4 ->
X1 pin5
Royal blue X2 pin5 ->
X1 pin4
1000ma 10.8V 460-465nm* C3535M-BNL1-A1J11H, 27lm up @ 350mA, 3pcs
Violet X2 pin6 ->
X1 pin3
800ma 11.2V 400-410nm
C3535U-UNL1-A1G11H, 850-900mW @ 500mA
C3535U-UNL1-A1G11H, 850-900mW @ 500mA
C3535U-UNL1-A1G11H, 700mW up @ 500mA
Blue X2 pin7 ->
X1 pin2
1000ma 3.3V 475-480nm Luxeon C BLU1000000000, E40
Cool white X2 pin8 -> X1 pin1 1000ma 7.2V CCT7000-8300K C3535L-C0L1-A1G11H, 148-156lm @ 350mA, 2pcs
* Indicated the dominant wavelength, peak approximately is 460-462нм.
The binning info of TSLC C3535L/C3535M. 


Total power consumption, W: ​ up to 39
Board dimensions:  
             Length, mm / in   70 / 2.76
            Width, mm / in 60 / 2.36
            Height, mm / in 7.4 / 0.29
Mounting holes diameter, mm / in 3.3 / 0.13
Mounting holes spacing, mm / in 47.5 / 1.88
Weight, grams / oz 33 / 1.16
Completely solderless assembly. Matching connectors are included. YES

The LED assembly must be used with matching LED drivers. 



  • Full-spectrum
  • Small dimensions (size is determined by secondary optics)
  • 10 power LEDs, C35 generation by Semileds
  • 2 newest LEDs Luxeon C color
  • 9 LED types combined in 7 independent channels, to provide unique control over spectrum
  • Sufficient radiation in true violet range, to provide for best coloration, fluorescence, and coral growth*
  • Minimized “Disco effect”, due to densely populated LEDs and the use of hybrid secondary optics with diffusers
  • A completely solderless solution simplifies the assembly
  • 100% quality control for all LEDs on the assembly



“*” no competing solutions were available on the market by January, 2017.

Make a DIY LED fixture using our LED assembly: Video Tutorial:

Note: – the tutorial was made using rev. 2.2 of the 6-channel LED assembly and a different connector. You can also watch our video tutorial on how to use the new connectors.

Using the KRP crimper tool:

Theoretical and practical aspects of LED lighting

What type of light is available to corals in nature? What type of light do corals require for growth and for best coloration? Under what spectrum will your reef tank look its best? You will find the answers to these questions in this section.

All you need for DIY

Do you want to build a DIY LED fixture that would best fit your tank’s requirements, using the state of the art technological achievements and the highest grade components? You will find the answers to these questions in this section.


Building a DIY LED fixture has never been so easy! Find the answers to many questions that hundreds of others have asked. Everything you want to know about building DIY LED fixtures is available in this section.