MOUNTAIN VIEW, Calif., July 16 -- High-brightness light-emitting diodes (LEDs) have been a bright spot in an otherwise dismal market for semiconductors and optical components of all types, according to Silicon Valley market research firm Strategies Unlimited. While the markets for most electronic and optical components peaked in 2000 and have since tended to decrease, the high-brightness LED market grew by 51 percent in 2002 to $1.84 billion, the company said, and this market is forecast to grow to $4.7 billion by 2007. 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