This durable, PMMA, clear plastic lens is used to establish a 15-degree beam distribution. It easily snaps into the TE Standard Series Surface and Recessed mount channels, as well as the TE Enhanced Series 30-degree surface mount channel. With its audible click, it's easy to confirm when the lens is properly installed throughout the channel. The clear diffuser provides protection for the LEDs within, while emitting light with little dilution.