Expert Talks on Light: Challenges and Solutions when Designing Large Cluster Multi-color LED Sources

View the talk on YouTube – LpS Digital Conference

Presenter: Rob Engelen; Duration: 27:20 min.

The presentation by Rob Engelen, Director of LED Applications Engineering at Lumileds, delves into the complex challenges and innovative solutions involved in designing high-density multicolor LED arrays. These arrays are critical in applications such as architectural flood lighting, stage and studio lighting, where the requirements for precise color control, high light output, and compact designs are paramount.

Engelen outlines the various application segments for multicolor LED fixtures, comparing different fixture types with regards to design simplicity, color uniformity, and thermal complexity. He emphasizes the need for achieving optimal color mixing, where well-blended multicolor arrays create high-quality light with minimal losses. For effective color mixing, high drive currents, superior thermal management, and compact, close-packed LED arrangements are required, though these demands often conflict, necessitating careful engineering trade-offs.

The presentation also examines crucial aspects of electrical routing in these LED arrays, with specific emphasis on a three-stripe footprint layout that enhances routing and color mixing in compact configurations. Additionally, Engelen discusses material choices for the substrate, such as insulated metal and copper pedestals, which help manage thermal dissipation efficiently, allowing higher drive currents without overheating.

Another focal point is the use of domes over LEDs to improve light output, flux efficiency, and control the beam angle, though Engelen also notes that dome-less designs may be advantageous for certain compact configurations.

In conclusion, this presentation provides a comprehensive overview of the key design considerations for high-density multicolor LED arrays, highlighting Lumileds’ solutions and advancements that address the technical complexities of modern lighting applications. For further information on products like the LUXEON C ES Color Line, contact details are provided for interested professionals.

View the talk on YouTube – LpS Digital Conference

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