Abstract: A method of accurately controlling at least one of an intensity, brightness, dimming or color mixing of a LED, the method comprising monitoring an actual current flowing through the LED, selecting a specific current based on at least one of a desired illumination intensity, a desired brightness, a desired dimming, or a desired color mixing, comparing said actual current and said specific current, and if a difference exists between said actual current and said specific current, adjusting said actual current to agree with said specific current.

Abstract: A filter system utilizing a coalescing-type filter element with at least one end cap and a transport layer such that contaminants are filtered from a gas stream, coalesced and drained from the filter element completely exterior to any other component of the filter element. The filter element includes a drainage sleeve which may extend over and exterior to at least one end cap. The filter element may include a transport layer disposed exterior to a drainage layer extending between end caps. The present invention further includes a method for decontaminating a gas stream utilizing the filter system and filter element.

Abstract: A filter system utilizing a coalescing-type filter element with an end cap which snap locks into a filter system. One embodiment includes elongated snap lock arms. Another embodiment includes shortened arms. A third embodiment includes a snap lock ring. The snap lock arms and the snap lock ring may include an extrusion for mating with a depression in the intake of the filter system. Alternatively, the snap lock arms and snap lock ring may include a depression for mating with an extrusion on the intake of the filter system. Further, the filter system may be arranged such that the end cap snap locks into an outlet of the filter system.