A common application of the compounds of sodium is the sodium-vapour lamp, which emits light very efficiently.
ɐ kˈɑːmən ˌæplɪkˈeɪʃən ʌvðə kˈɑːmpaʊndz ʌv sˈoʊdiəm ɪz ðə sˈoʊdiəmvˈeɪpɚ lˈæmp, wˌɪtʃ ɪmˈɪts lˈaɪt vˈɛɹi ɪfˈɪʃəntli.