Psalm 19/Notes/Lexical.V. 9.74839

• The word פקודים refers to "rules regulating behavior" (SDBH). Whereas the previous verse used singular nouns to describe the Mosaic Law as a whole—תורה (covenant instruction) // עדות (the whole body of covenant stipulations)—this verse uses a plural noun to refer to the individual commandments of the covenant.
• The word מצוה refers to YHWH's authoritative command (cf. TDOT 1997, 505 for מצוה "as an expression of authority"). It is probably a collective singular here (so Gesenius 2013, 724: "das Gesetz Gottes als Einheit"; cf. Ps 119:96; cf. ketiv מצותו in Deut 5:10; 7:9; 8:2)
• In light of the comparison between the sun in vv. 5-7 and YHWH's law in vv. 8-10, Eaton argues that ברה does not mean "pure" but "brilliant" (so LXX τηλαυγής 'far-shining' [LSJ] and Jerome lucidum ['bright, shining']; cf. Song 6:10 בָּרָה֙ כַּֽחַמָּ֔ה "bright as the sun" [NIV]) (Eaton 1968, 605). So NIV and CSB: "radiant"; CEV: "shine brightly." It could be that a double-meaning is intended: "flawless" (with an association with "brightness").
• Giving light (מְאִירַת): an action that causes something to emit or to reflect light; ≈ associated with well-being and wisdom" (SDBH). Light to the eyes indicates renewed life and energy. In this sense, it is synonymous with משיבת נפש in the previous verse. Clines argues, on the other hand, that a description which is so synonymous with משיבת נפש would be unnecessary. "It seems preferable therefore to follow the literal meaning of the words, especially since the law is elsewhere often called a light" (cf. Ps 119:105; Prov 6:23) (Clines 1974, 4-5).