perl -le '@full = ( 0..100 );
for ( @full ) {
  print STDOUT "$_: LIGHTS ON" if /20/ .. /30/;
  print STDOUT "$_: LIGHTS OFF" if /60/ .. /70/;
}
'
__output__
20: LIGHTS ON
21: LIGHTS ON
22: LIGHTS ON
23: LIGHTS ON
24: LIGHTS ON
25: LIGHTS ON
26: LIGHTS ON
27: LIGHTS ON
28: LIGHTS ON
29: LIGHTS ON
30: LIGHTS ON
60: LIGHTS OFF
61: LIGHTS OFF
62: LIGHTS OFF
63: LIGHTS OFF
64: LIGHTS OFF
65: LIGHTS OFF
66: LIGHTS OFF
67: LIGHTS OFF
68: LIGHTS OFF
69: LIGHTS OFF
70: LIGHTS OFF