The **L2CE-50-R** is a specific part number belonging to the **LUMILEDS LUXEON CoB (Chip on Board) Core Range**. These are high-power LED modules designed for professional lighting applications. --- ## 1. Technical Specifications Breakdown The part number follows a specific nomenclature that defines its electrical and optical characteristics: | Feature | Specification | Description | | :--- | :--- | :--- | | **Product Series** | LUXEON CoB | High-density LED array on a ceramic substrate | | **Nominal CCT** | 5000K | Cool White light color | | **CRI (Minimum)** | 70 | High efficiency, standard color rendering | | **Typical Flux** | ~2,500 - 15,000 lm | Depends on specific Gen/Size (R denotes specific binning) | | **Typical Voltage** | ~34V - 36V | Direct Current (DC) forward voltage | | **Test Current** | 450mA - 1200mA | Varies by LES (Light Emitting Surface) size | --- ## 2. Key Electronic Components & Construction A CoB LED like the L2CE-50-R is not a single diode, but an integrated assembly: ### A. The LED Array * **Series-Parallel String:** Internally, the module contains dozens of small LED chips wired in a combination of series and parallel strings to achieve the target voltage and current. * **MCPCB/Ceramic Substrate:** The chips are mounted on a highly thermally conductive substrate to pull heat away from the junctions. ### B. Phosphor Layer * The "yellow" surface visible on the part is a silicone-phosphor mix. Since the base LEDs emit blue light, this layer converts it into **5000K Cool White** light. ### C. Thermal Management * **Thermal Resistance ($R_{\theta j-c}$):** This part features very low thermal resistance, allowing it to operate at high wattages without burning out, provided it is attached to an adequate heatsink. --- ## 3. Application Requirements To operate the L2CE-50-R correctly, the following electronic environment is required: 1. **Constant Current Driver:** LEDs must never be driven by a constant voltage source. You need a DC driver (e.g., 900mA constant current). 2. **Thermal Interface Material (TIM):** A thermal pad or grease must be used between the back of the L2CE-50-R and the heatsink. 3. **COB Holder:** Often used to provide mechanical pressure and electrical connection without soldering directly to the pads. --- ## 4. Common Use Cases * **Industrial Lighting:** High-bay and low-bay factory lights. * **Outdoor Lighting:** Street lights and architectural floodlights. * **Commercial:** High-intensity spotlights for retail.