The **FP16391** refers to a specific optical component from the **LEDiL HEIDI** series. Specifically, the model is the **HEIDI-SS-V**, which is a high-efficiency subminiature lens designed for high-power LEDs. While it is an optical part, its performance is critical to the electronic design of LED lighting systems. --- ### 1. Technical Specifications Below are the primary technical characteristics of the FP16391 lens: | Specification | Details | | :--- | :--- | | **Series** | HEIDI | | **Beam Type** | Smooth Spot (SS) | | **Dimensions** | 25.0 mm (Diameter) x 11.7 mm (Height) | | **Material** | PMMA (Polymethyl methacrylate) | | **Typical FWHM** | ~7° - 9° (Depending on LED used) | | **Fastening** | Pin and Tape (Adhesive) | | **Efficiency** | ~90% | --- ### 2. Compatibility and Integration The FP16391 is designed to be compatible with a wide range of electronic light sources, specifically high-power surface-mount (SMD) LEDs. #### Supported LED Types * **Cree:** XP-E, XP-G, XT-E, XP-L * **Samsung:** LH351B, LH351Z * **Lumileds:** LUXEON Rebel, LUXEON Z ES * **OSRAM:** OSLON Square, OSLON SSL 80/150 #### Assembly Components 1. **Lens (FP16391):** The optical focus element. 2. **Adhesive Tape:** Pre-applied to the bottom for secure mounting to the PCB. 3. **Alignment Pins:** Two small pins on the bottom to ensure the lens is centered perfectly over the LED die. --- ### 3. Electronic Design Considerations When integrating the FP16391 into an electronic circuit, engineers must consider the following: * **Thermal Management:** While the lens is PMMA (stable up to ~80-90°C), the high-power LED underneath generates significant heat. The PCB (typically an MCPCB - Metal Core PCB) must dissipate heat effectively to prevent the lens from warping or yellowing. * **Optical Center:** The LED must be placed at the exact coordinates defined by the lens's alignment pins in the CAD layout to ensure the "Smooth Spot" beam pattern is achieved. * **Z-Height:** The lens is designed for LEDs with a specific height. If using an unconventional LED, the focal point may shift, altering the beam angle. --- ### 4. Typical Applications * Architectural lighting (spotlighting details). * Flashlights and portable torches. * Commercial indoor spot lighting. * Museum and gallery lighting.