Extrusions serve multiple purposes, including: Providing a protective housing. The channel acts as a protective casing for the LED strip, shielding it from dust, debris, and physical damage. Heat dissipation: Surface channels often have designs that help dissipate heat generated by the LED strip, ensuring optimal performance and extending the lifespan of the lighting system. Diffusing light: The channel comes with a diffuser cover that helps distribute and soften the light output, reducing glare and creating a more even illumination. Concealing wiring: Surface channels can hide the wiring and electrical connections, resulting in a neater and more aesthetically pleasing installation