It’s reported that the Bandai Group's Seeds Corp developed a LED lamp, through a cylindrical shade made of tracing paper or Japanese paper, looks like a burning and flickering candle.
The keys to the development are an acryl light guide panel that mimics the shape of a candle flame and the way of illuminating the white LEDs. It has grooves all over its surface so that the entire cone is illuminated. In addition, its external surface is painted orange to make the color of the light similar to that of the candle flame. By topping this light guide panel over the light-emitting part featuring white LEDs, the lamp recreates the shape of the candle flame.
The light-emitting part houses at least three white LEDs. They are in a straight line when there are three LEDs. The LED at one end changes brightness in the form of sine waves at a longer frequency, while the LED at the other end changes brightness in the same manner at a slightly shorter frequency. The LED in the center lights in the same waveform as the LEDs on the left and right. The frequency of switching the waveforms is about one-digit shorter than the frequencies of the sine waves that vary the brightness of the LEDs on both sides.
According to Seeds, this brightness control "enables the lamp to express candle flame waning, almost fading out and cheerfully burning again," The product can be used as standard lighting if the brightness variation is switched off.
