A first set of orange LEDs with a peak wavelength emission of about 612 nanometers, a second set of red light emitting LEDs with a peak wavelength of about 660 nanometers, and blue light LEDs. Two beam spreads, 15° and 30°, were provided for both the 660 nm LEDs and 612 nm LEDs. When directed perpendicularly...http://www.google.com/patents/US6921182?utm_source=gb-gplus-sharePatent US6921182 - Efficient LED lamp for enhancing commercial and home plant growth
