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“Biological specific lights,” tuned so as not to interfere with an individual’s normal production of melatonin, the hormone secreted from the pineal gland linked to sleepiness, could begin to hit the market in about two years, according to Mr. Fred Maxik, a founder of the Lighting Science Group With a biological bulb, you could read at night without experiencing the nagging irritability that can occur after using a computer or sitting close to a lamp near bedtime. Industry experts and executives suggest that efficiency will become a Trojan horse for a host of unexpected and arguably more valuable applications. LEDs, after all, are semiconductors that can be programmed to emit light at precise wavelengths, colors and tones.
10/7 NY Times