var temperature = new iro.ColorPicker('#temperature', {
 layout: [
 { 
 component: iro.ui.Slider,
 options: {
 sliderType: 'kelvin',
 minTemperature : 2000,
 maxTemperature : 9000,
 layoutDirection: 'horizontal'
 }
 },
 ]
});

temperature.on('input:end', function(color) {
 console.log(color.kelvin);
});