Color-changing light-emitting-diode bulbs contain several LEDs of different colors. The bulb simply turns on, while different LEDs create different colors. For instance, an LED bulb may contain yellow, blue and red LEDs and switches on both the yellow and blue LEDs to create a green light.
Some color changing LED bulbs are set to cycle through a color pattern and frequency set up by the manufacturer. These bulbs are really suitable for parties. Other LED bulbs intended for practical use in the form of a downloadable software app, and these bulbs may contain more yellow LEDs than any other to create better light for work or reading.