12х medium-beam lens (FWHM40)
Version 1.0 Product code: 12xFWHM40


Availability:  Pre-order


Lens dimensions:  
             Outer diameter, mm / in   45 / 1.77
             Height, mm / in 7.8 / 0.31
Weight, grams / oz 8 / 0.28
Divergence angle FWHM40
Front surface finish smooth

When using a diffuser divergence angle increases to FWHM80.



  • High efficiency
  • Low profile
  • When hanging high above water surface, can be used without diffusers
  • Attach with neutral silicone ot other neutral glue (do not use Cyanoacrylates, also known as "superglue")

          Recommended for use with
          In case of installation with diffuser, the recommended height above water is 25-40cm
          In case of installation without diffuser the recommended height above water is 40-60cm




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.