my %Log_names = (
               "BM_therm_boiler_00_state"  => { 'events_log' => 1 },
               "BM_therm_house_00_state"  => { 'events_log' => 1 },
               "BM_therm_hpump_00_state"  => { 'events_log' => 1 },
               "BM_swi_"  => { 'device_log' => 1 },
              );


##</code><code>##

if exists $Log_names{"BM_light_test_00_"}{"device_log"}

##</code><code>##

$VAR1 = {
          'BM_light_test_00_' => {},
          'BM_swi_' => {
                         'device_log' => 1
                       },
          'BM_therm_house_00_state' => {
                                         'events_log' => 1
                                       },
          'BM_therm_boiler_00_state' => {
                                          'events_log' => 1
                                        },
          'BM_therm_hpump_00_state' => {
                                         'events_log' => 1
                                       }
        };