Usage: 5 forms in 5 verses
Form Translated As     In Verse(s)
εξαφθείσα being lit up LXX.Ezek.20.47
εξήψε he lit up LXX.Num.8.3
εξήφθησαν they perched LXX.Lam.4.19
εξήπται lights up LXX.Prov.22.15
εξάπτη Aaron should ignite LXX.Exod.30.8

Liddell-Scott-Jones

ἐξάπτω (exaptō) to light up G:V

ἐξάπτω,

fasten from or (as we say) to, πεῖσμα νεὸς.. κίονος ἐξάψας μεγάλης having fastened it to a pillar, [Refs 8th c.BC+] — passive, περὶ τὴν κεφαλὴν ἐξῆμμαι πηνίκην τινά I have a wig fastened on my head, [Refs]

__2 metaphorically, . στόματος λιτάς let prayers fall from one's mouth, [Refs 5th c.BC+]; τῆς τύχης . τὰ πραττόμενα consider actions as dependent upon chance, [Refs 1st c.AD+]; . τὴν διαδοχὴν τῶν ἀξίων λόγου continue the narrative, [Refs 3rd c.AD+]; ἐξαμμένος ἐκ σώματος dependent on it, [Refs 5th c.BC+]
__3 . τινί τι place upon, ἱκετηρίαν γόνασιν [Refs 5th c.BC+]
__II middle, hang by, cling to, πάντες ἐξάπτεσθε all hang on, [Refs 8th c.BC+]; . τῆς οὐραγίας, τῆς πορείας, hang on the enemy's rear, on his line of march, [Refs 2nd c.BC+]; τῶν πολεμίων, τῆς μάχης, [Refs 1st c.BC+]attend to.., [Refs 1st c.BC+]; cling to an authority, [Refs 1st c.AD+]
__II.2 hang a thing to oneself, carry it suspended about one, wear, κώδωνας [Refs 5th c.BC+]; also . ναῦς fasten them to one's own ship, take in tow, [Refs 1st c.BC+]; . τοὺς ἐραστάς have them hanging about one, [Refs 2nd c.AD+]
__B active also, set fire to, [ὕλαν] [Refs 5th c.BC+]
__B.II kindle, inflame, πόλεμον [Refs 2nd c.AD+]; of love, [Refs 6th c.AD+]; νόσημα aggravate, [Refs]:—passive, πῦρ . ἐκ λίθων [Refs 4th c.BC+]; ὑπὸ φιλοσοφίας ὥσπερ πυρός to be inflamed by.., [Refs 5th c.BC+]; αὖθις οὐκ -ονται they are not rekindled (like Heraclitus' sun), [Refs 1st c.BC+]are turned to flame, [Refs 2nd c.AD+]