TEKKNI M21 11-3422-20 is a frosted polycarbonate (PC) diffuser for the ARRE LED profile. It is 2.02 m long, with a curved cross-section and edges shaped to fit the profile. This is a separate cover, not a complete ARRE lighting kit.
Matching the ARRE system
Both the length and the M21 designation matter when choosing a replacement or completing an installation. The manufacturer lists this diffuser for ARRE; a similar length does not make a different cover interchangeable. Code 11-3422-20 identifies the frosted finish, distinct from the milky and transparent versions.
A cover for linear lighting
The ARRE system is intended for illuminating cabinets, worktops and display areas. M21 forms its visible curved cover above the LED strip. Choose the matching profile and other system components when assembling the installation, rather than treating the diffuser as a standalone light fitting. The light colour and brightness depend on the LED strip used, not on the M21 designation itself.
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