Feature: LEDs (Image credit: Lumileds)


Figure 3: XR-5050 SQR module by Lumileds


designs under the Zhaga-D4i standard umbrella, ready to support both local and remote control, as well as 5G deployment further in the future. Te D4i rollout is also finding support


Figure 2: The first UV LED-based water treatment units installed in a facility near Carlisle, UK


a narrow beam. Compact and lightweight, the UVC LED unit can be added to existing lighting fixtures, or fully integrated into future designs to add the value of indoor air disinfection to the standard visible illumination function, or to operate in standalone air-disinfection mode. Te adoption of UVC LEDs in municipal


water treatment works is also forecast to gather pace aſter the first installation in 2020; see Figure 2. Te use of UVC irradiation to eliminate microbial contamination from water supplies is well understood. Using LED technology, manufacturers can realise new, more-compact reactor designs that fit the limited available space in existing plants, greatly reducing or eliminating the cost of new space for disinfection equipment. In addition, the use of LED technology entails lower maintenance cost and effort than conventional UVC emitters; see Figure 2.


Innovation in LED formats While development in the UVC LED field has centred on the fundamental performance of the emitter, manufacturers are bringing innovation to packaging, production and reliability in the LEDs used in streetlights. Until recently, streetlight designs were


based on single-chip, high-power LEDs. Now, however, streetlight manufacturers are using newer LED platforms, such as multi- chip high-power LEDs like the popular 5050


package, and mid-power LEDs, generally in the standard 3030 format. Te move has been possible because LED manufacturers have improved the reliability of recent generations. In particular, sulphur resistance has been improved and L90 projections can now exceed 100,000 hours. Lumileds is a good example of the


progress that has been made; its LUXEON 5050 Square LED is a popular choice for streetlights. Its XR-5050 SQR modules (Figure 3) are compliant with the Zhaga Book 15 footprint and meet the most stringent tender requirements. Benefits of using newer LED types


include: • Superior efficacy, especially at the lower CCT (correlated colour temperature) values specified by measures aimed at limiting light pollution;


•Greater design flexibility; • Lower system cost. Innovation is also reshaping the market’s


approach to control and networking of streetlight arrays. Europe has been at the forefront of this move, leading the standardisation of control interfaces for streetlights. Zhaga and DiiA have joined forces with the IES to back the D4i standard, and ANSI C136.41 receptacle-based hybrid architectures are to be added to the Zhaga Book 18 Ed. 3.0. Tis is enabling streetlight manufacturers to develop futureproof


32 July/August 2021 www.electronicsworld.co.uk


among driver manufacturers: Inventronics with its EUM series, for example, was the first to qualify IP67-rated drivers to the D4i standard.


Technology trends to follow Global distributor Future Lighting Solutions sees evidence today of rising demand for further technology developments, with more innovations in the pipeline. In December 2020, for instance, Nichia unveiled a phosphor-converted cyan LED- based Circadian Tune solution, expected on the market this summer. In streetlighting, the march of 5G mobile


networks will have a profound impact. Te massive machine-type communication (mMTC) feature in 5G will enable new central-monitoring capabilities for municipal lighting. Tere is great promise in efforts to make streetlights the IoT hub of smart cities. Streetlight poles are also an ideal host for the 5G microcells required for dense network coverage in urban areas. And the collaboration between the Bluetooth Special Interest Group and the DiiA will undoubtedly fuel the adoption of both D4i and Bluetooth mesh in indoor lighting, following the release of Zhaga Book 20. Tus, the rate of innovation in LED


technology gives great cause for optimism as the world emerges from its Covid-induced slump, and the prospects appear particularly strong in UV LEDs, streetlighting and human-centric lighting.


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