ɪn mˈɑːdɚn tˈaɪmz, ɪɾ ɪz ˈædᵻd tə kwˈɔːɹts ænd sᵻɹˈæmɪk mˈɛɾəl hˈælaɪd lˈæmps ðæt jˈuːzᵻz ɹˈɛɹˈɜːθ hˈælaɪdz lˈaɪk dɪspɹˈoʊsiəm, tʊ ɪŋkɹˈiːs ðɛɹ ɪfˈɪʃənsi ænd tə ɡɛt ðə lˈaɪt kˈʌlɚ mˈoːɹ klˈoʊs tə ðə blˈækbɑːdi lˈoʊkəs.
In modern times, it is added to quartz and ceramic metal halide lamps that uses rare-earth halides like dysprosium, to increase their efficiency and to get the light color more close to the blackbody locus.