Margen de 2 horas en select

<label for="hour_delivery">Hora de Entrega</label>
                <select class="form-control input-lg" id="hour_delivery" name="hour_delivery">
                    <option value="">Selecciona Hora de Entrega</option>
                    @for( $he = 7.5; $he < 17; $he+=2 )

                        @php
                            
                            if( strpos( ( string )$he, "." ) !== false ){
                            
                                $heArray = explode( ".", ( string )$he );

                                if( $heArray[0] < 10 ){

                                    $heTimeInit = "0" . $heArray[0] . ":30";
                                }
                                else{

                                    $heTimeInit = $heArray[0] . ":30";
                                }
                                
                                $heTimeEnd = ( $heArray[0] + 1 ) . ":00";
                            }
                            else{

                                if( $he < 10 ){

                                    $heTimeInit = "0" . $he . ":00";
                                }
                                else{

                                    $heTimeInit = $he . ":00";
                                }

                                $heTimeEnd = $he . ":30";
                            }
                        @endphp

                        <option value="{{ $heTimeInit }}">{{ $heTimeInit . ' - ' . $heTimeEnd }}</option>
                    @endfor
                </select>

<?php

$begin = new DateTime('8:00');
$end = new DateTime('15:00');
$end = $end->modify('+1 hour');
$interval = new DateInterval('PT1H');
$margin = '+2 hour';

$dateRange = new DatePeriod($begin, $interval ,$end);
?>
<br><br>
<select style="width:150px">
<?
foreach($dateRange AS $date)
    echo '<option value="'.$date->format('H:i').'">'.$date->format('H:i').' - '.$date->modify($margin)->format('H:i').'</option>'
;
?>
</select>