New methodology enable solid state lighting to measure and self-adjust based on conditions

New methodology enable solid state lighting to measure and self-adjust based on conditions
These four examples show (a) the best fit (blue solid line) to daylight D65, (b) an incandescent spectrum, (c) the melanopic, and (d) a white LED spectrum (Ph-LED YAG) (dashed black lines) made by optimizing the weights of the 10 different channels of the LED light engine (colored dash-dot lines). In all cases, the spectra were normalized and are shown in arbitrary units. Credit: Aleix LlenasCatalonia Institute for Energy Research, Jardins de les Dones de Negre 1 PL2, Sant Adrià de Besòs, B (Spain)Josep CarrerasLedmotive Technologies, Jardins de les Dones de Negre 1 PL2, Sant Adrià de Besòs, Barcelona (Spain)

An article published in the SPIE journal Optical Engineering, "Arbitrary spectral matching using multi-LED lighting systems," marks a substantial advance in lighting science and technology. In their paper, the researchers announce a two-pronged approach to both measure and self-adjust the spectral power distributions (SPDs) of LED lighting systems. Their methodology demonstrates the system's ability to maintain consistency and stability over an extended period of time.

Solid State Lighting (SSL) can be used to enhance our vision, sleep patterns, and wellbeing. SSL benefits are evident across their wide use in residences and offices as well as across industrial and commercial sectors, including the ongoing development of applications in medicine, imaging, agriculture, communication, transportation, and museum lighting. Some of these applications require highly precise spectra that don't produce optical power variations or shifts in color over time.

The open-access paper addresses two challenges: how to keep temperature changes and age-based deterioration from impacting a light emission's strength, consistency, and color, as well as providing a reliable, internal, self-monitoring method.

The authors use a fast-computation, high spectral fidelity algorithm to determine channel weights of a targeted SPD; in conjunction with that method, an internal microprocessor provides a closed-loop control system that monitors and corrects the spectral output, compensating for shifts due to or LED wear and tear. The authors' use of a general framework for multi-channel SSL systems, ensures the universal applicability of their findings across different lighting technologies.

According to Optical Engineering Associate Editor, SPIE Senior Member, and U.S. Air Force Research Laboratory Technical Advisor Daniel A. LeMaster, the research showcases significant advances in terms of lighting technologies, "This method to monitor and quickly compensate for the colorimetric issues that arise from junction heating and LED aging will be of great utility in the global LED lighting market."


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More information: Aleix Llenas et al, Arbitrary spectral matching using multi-LED lighting systems, Optical Engineering (2019). DOI: 10.1117/1.OE.58.3.035105
Provided by SPIE
Citation: New methodology enable solid state lighting to measure and self-adjust based on conditions (2019, March 29) retrieved 25 August 2019 from https://phys.org/news/2019-03-methodology-enable-solid-state-self-adjust.html
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