Abstract: A lighting device with color temperature gradation is disclosed. The lighting device has a first white light emitting diode (LED) source with a first color temperature and a second white LED source with a second color temperature. The lighting device further comprises a controller adapted to generate a pulse width modulation (PWM) signal and to supply the first white LED with a first portion of the PWM signal and the second white LED with a second portion of the PWM signal in order to obtain a collective output of the lighting device with an output color temperature in between of a first color temperature and the second color temperature. The method of gradating the color temperature of a lighting device is also disclosed.

Abstract: The present invention relates to a piezoelectric touch-controlled faucet, falling under the technical field of automatic faucets. The faucet comprises a first end connected to a water supply source, a second end having a water outlet for the faucet, and a passage arranged between the first end and the second end for directing the water from the first end to the second end. The faucet further comprises an electronic valve arranged on the passage, and a touch area arranged on the external surface of the passage covering a certain area, wherein a piezoelectric sensor is arranged underneath the touch area, and an electronic control unit is connected to the piezoelectric sensor to receive signal from the piezoelectric sensor for controlling the electronic valve on and off. The electronic control unit may include an automatic time delaying unit.