jQuery(document).ready(function($){
$("#customize-control-bc_colour_picker_theme .wp-color-picker").wpColorPicker({
  'change': function(event, ui) {
      setTimeout(function(){
      color = ui.color.toString();
        updateInputs(color)
      },1)
  }
});

function updateInputs(color) {
        lighter = chroma(color).brighten(1);
        evenLighter = chroma(color).brighten(2);        
        $("#customize-control-bc_colour_picker_primary .wp-color-picker").wpColorPicker('color', color)        
        $("#customize-control-bc_colour_picker_secondary .wp-color-picker").wpColorPicker('color', lighter)
        $("#customize-control-bc_colour_picker_tertiary .wp-color-picker").wpColorPicker('color', evenLighter)
    }
})