WP_Query by meta_value first letter

loop.php

<?php
$args = array(
    'post_type' => 'faculty',
	'meta_query' => array(
		// 'relation' => 'AND',
		// array(
		// 	'key' => 'online-extra-type',
		// 	'value' => 'Your Space',
		// 	'compare' => '='
		// ),
		array(
			'key' => 'faculty-last-name',
			'value' => array( 'L', chr(ord('L')+1) ),
			'orderby' => 'meta_value',
            'compare' => 'BETWEEN',
            'order' => 'ASC'
		),
		array(
			'key' => 'faculty-last-name',
			'value' => chr(ord('L')+1),
			'orderby' => 'meta_value',
            'compare' => '!='
		)

	)
);
$devquery = new WP_Query( $args );
print_r($devquery);
 ?>