Preh develops a rear-climate-control system for the new Mercedes-Benz S-Class. The weight of the system can be reduced by more than 50% to about 7 oz. (200 g), compared with previous models. The difference largely stems from an elaborate light-guide design that allows illumination of the control panel with only 10 light-emitting diodes. The reduction in power requirements allows the omission of large, and consequently heavy, heat sinks, Preh says. Specially designed software manages ...

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