Elma Electronics promoted rugged light tubes, which has two high-efficiency dragon LEDs and a special aluminum body for thermal-management. 

Four standard lengths and various colors are available: three shades of white, red, green and blue. There are two types of connections, connecting leads and a plug-and-light version with a main plug.

The HB Light Tube single modules can be combined with rigid or flexible light guides in various lengths. They are also available in all monochrome colors and an RGB version.

The Elma light tubes feature the LED lighting housing in single or double-ended configurations. Lengths of up to 2m are available providing a wide sphere of lighting options for electronics, architecture, edge illumination, danger indication/alarm system, indirect illumination, and bright signal sources.  The end-caps can be swapped with different colors, offering more choices and various color blends.