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What is the purpose of the FTS-S and FTS-SS spacer rings, and why are they only used with the Lambertian Luxeon LEDs?

April 26, 2017LEDs luxeon purpose Rings Spacer Used

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What is the purpose of the FTS-S and FTS-SS spacer rings, and why are they only used with the Lambertian Luxeon LEDs?

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The spacer ring is used to position the lambertian optic at the correct distance from the LED. The Lambertian LEDs have a high dome (tall primary lens) and the Fraen optics need to be positioned above, and not touching the top of the Luxeon primary lens. The Batwing Luxeon has a low dome (short primary lens), and the Fraen optics for batwing LEDs have 4 small bumps to set the proper distance and assure clearance. Spacer rings are not used when the optic includes a holder.