FireFly is an LED light bulb with a twist. Standard bulbs are bought with a warmth rating, ranging from bright natural daylight to a warm, softer glow - but once you chose, you're stuck with that choice.

FireFly lets you change the warmth of your lighting on the fly. A rotating collar around the base of the bulb smoothly adjusts the color temperature from a soft candle-like glow, to a brighter incandescent yellow, up through whiter fluorescent, halogen, and finally daylight - and of course, everything in between.

Our team of two built this project in 24 hours for MakeMIT. The main bulb is 3D printed. A microcontroller inside the bulb reads the position of the collor, and uses MOSFETs to drive a high-current RGB LED strip.