Vermont Patent of the Month – September 2023

In today’s world, LED lighting has become the standard due to its energy efficiency and long-lasting properties. However, achieving the perfect quality of light that mimics natural sunlight has been a challenge. The human eye is sensitive to variations in light, and replicating the nuanced spectrum of sunlight has proven elusive. This is where innovations in tunable LED lighting systems, particularly those by LEDdynamics, Inc., come into play.

The human eye perceives colors differently under varying light qualities. Moreover, light affects our circadian rhythms, influencing our sleep patterns and overall well-being. To create lighting systems that genuinely mimic the sun’s light, scientists and engineers have delved into the realm of correlated color temperature correction (CCT) and circadian rhythm matching.

To understand the complexities of replicating sunlight, we look at the C.I.E. chromaticity diagrams. These diagrams illustrate the range of visible colors and the blackbody locus, which represents the sun’s emissions. Sunlight changes throughout the day, making it challenging to replicate artificially.

LEDs, known for their energy efficiency and longevity, have become the modern choice for lighting. However, their light output is different from a blackbody emitter like the sun. LEDs produce light at discrete wavelengths, resulting in a limited spectrum. Conventional white LEDs often fall short of reproducing the sun’s full spectrum.

LEDdynamics has been at the forefront of developing tunable lighting systems that address the challenges of CCT correction and circadian rhythm matching. Their systems consist of multiple LEDs and sophisticated correction circuits, including correction LEDs.

LEDdynamics’ correction circuits are designed to balance the outputs of different LEDs to achieve the desired spectral characteristic. These circuits can include capacitors, correction diodes, charge restorative devices, and microprocessors for precise control.

One key innovation is the combination of cool white LEDs, warm white LEDs, and green LEDs to replicate the blackbody curve’s spectral characteristic. This approach allows for accurate color rendering and circadian-rhythm matching, addressing the need for both natural-looking and health-conscious lighting.

LEDdynamics’ tunable lighting systems are not just about mimicking sunlight’s color; they are also tailored to match circadian rhythms. These systems provide the right light signals for optimal sleep, alertness, and overall health.

As our understanding of human biology and lighting technology advances, tunable LED lighting systems like those pioneered by LEDdynamics will play an increasingly crucial role in our lives. These systems offer the promise of not only energy-efficient lighting but also lighting that supports our well-being and enhances our environments.

Are you developing new technology for an existing application? Did you know your development work could be eligible for the R&D Tax Credit and you can receive up to 14% back on your expenses? Even if your development isn’t successful your work may still qualify for R&D credits (i.e. you don’t need to have a patent to qualify). To find out more, please contact a Swanson Reed R&D Specialist today or check out our free online eligibility test.

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