getVariableInFunctions.php

<?php
function useReduxVariables() {
  // Redux does some nifty setup things. To use the variables inside your functions.php file you will need to run your
  // code inside a function run at the init hook or later. 
 
	// In this example we assume that demo mode is turned on. You can sub your variable name here to get your values.
	global $redux_demo;
	print_r($redux_demo);
 
}
add_action( 'init', 'useReduxVariables');

getVariableInTheme.php

<?php
// Due to a limitations of variables and functions, you must globally define
// variables inside functions.
global $redux_demo; // This is your opt_name.
print_r($redux_demo);