How do I Change color of Placeholder text on search bar on toolbar using angular material?

Question

Need to change the color of the placeholder text. it is showing up dark. This should be done without using any CSS.

var themename = angular.module('themename', ['ngMaterial', 'ngAnimate'])
    .config(['$mdThemingProvider', function ($mdThemingProvider) {
        $mdThemingProvider.theme('default').primaryPalette('light-blue', {
            'default': '700',
            'hue-1': '500',
            'hue-2': '900',
            'hue-3': 'A700',
        }).accentPalette('orange',{
            'default': 'A200',
            'hue-1': 'A100',
            'hue-2': 'A400',
            'hue-3': 'A700',
            });

    }]);`