ipas_and_apis.js

  // Turn LED straight on, no transition
  powerLED.change({
    colour: [255, 255, 255]
  });

  rgb.on()
  rgb.colour([255, 255, 255])
  rgb.off()

  // Fade LED on rather than just
  // turning straight on
  powerLED.change({
    colour: [255, 255, 0],
    transition: {
      easing : 'easeInOut',
      duration: 1000
    }
  });

  rgb.off()
     .colour([255, 255, 255]) // <- happen instantly

  // d3 style
  rgb.transition()          // <- all state changes after
      .duration(1000)       //    transition() happen over
      .easing('easeInOut')  //    time
      .on()