The answers relate to light or house
The ght clues are about to illumination either natural or man made. The house clues relate to a residence from structure to contents:
1. Sunday! Lighthouse open: come and see (8)
2 Leaves the site withot fifty (5)
6 Stabs leeks and bacon here (5)
13 Drop the last plumb line and we retire(3)
14 Put gizmo onh lightening conductors (9)
22 Compare suds to keep out wet (4 7)
23 Her is fitted vehicle with dog (6)
25 End Charlie's hopes of being a leading light (11)
26 A donor loses a note on entry (4)
28 Draw across twelve (7)
30 People in ornate surroundings losing Ed (8)