laravel5.1 Manually Authenticating Users

In my app I use the default authentification to login my users to their dashboard. Now I would like to create a backend for supporters and one for admins. I use this code at the moment to login as admin:

<?php

namespace App\Http\Controllers\Admin;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use App;
use Artisan;
use Validator;
use Auth;

class AdminLoginController extends Controller
{

    public function index()
    {
        return view('admin.login');

    }

    public function authenticate(Request $request)
    {
         if (Auth::attempt(['username' => $request->username, 'password' => $request->password, 'id' => 1])) 
        {
            // Authentication passed...
            dd("correct");
        }
        else
        {
            dd("login data incorrect!");

        }
    }

}

How can I use now the well known redirects after login. In my AuthController I use for the users I use this code:

/**
 * Where to redirect users after login / registration.
 *
 * @var string
 */
protected $redirectTo = '/dashboard';
protected $redirectAfterLogout = 'auth/login';
protected $redirectPath = '/dashboard';

1.) How can I use this in my code above? I would like to redirect admins logged into the app like users to specified urls using this laravel feature.

2.) What's the best way, to check more "ids" in the if statement? Because there will be more than one admin.

via Chebli Mohamed