This invention relates to a light emitting diode (LED) and a LED lamp consisted of LEDs. The LED comprises at least one LED chip. The LED is mounted on a high heat conductivity base and is connected to an applied power supply through a circuit board. The LED chip also has a transparent medium layer on...http://www.google.es/patents/US7497596?utm_source=gb-gplus-sharePatente US7497596 - LED and LED lamp
