Barclays microprocessor analyst Blayne Curtis thinks that Silicon Labs Inc.’s recently announced ultraviolet light sensorcould be popping up in the fabled iWatch, a much-rumored wearable tech device thought to be in the works at Apple Inc., according to Apple Insider. Apple’s potential business could be a $4 million revenue boost for Silicon Labs, according to Apple Insider. The sensor would help the watch notify the user that he or she is about to be sunburned.