The unclued lights (one of two words) are of a specific kind. Ignore all accents.
Across
1 H-E-X? (5)
4 Series of numbers causing confab about 1 and 101 (9)
10 In an alienating way, first disproving 4 = 4. See? (10)
11 Shaver heard to be one on the way up? (6)
14 The wall in France is found in Madagascar (5)
15 Excessively fussy, reportedly, of photo (5)
16 Slave’s firework (6)
22 Art instructor, drink importer (8, hyphened)
23 John by landing-stage is crazier (7)
29 Tall herb — one seen in battered Mercedes, rear missing (8, hyphened)
32 Gold in principal part of soft ground (6)
34 Hurled, recoiled and quickly moved feet away (5)
35 Certain urtext reflecting some Christian (5)
36 Festival at noon at the Orient (7)
38 Chlorophyta range eagle chewed (10, two words)
39 Deeply felt, counting 20, 30, 40 … — regularly really (9)
40 Burns’ dwarf at mill (5)

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