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LEDs are now acknowledged as the mainstream standard light source of what might reasonably be called ‘the future already in progress’. Their small size, powerful light emission, extreme reliability, low energy requirement and long lifespan mean that LEDs continue to make quick inroads in automotive sectors governed by cost and performance demands alike. Indeed, since the last edition of this report was published in 2010, the sector has continued to witness a blistering rate of innovation, and LEDs have now broken every automotive application barrier. Nevertheless, there are other light source technologies that have sprung from LED research and development, and some are poised to supplement – or even, in certain applications, supplant them.