IPA Transcription of "spectral luminous efficiency" in British English

The British English IPA transcription of “spectral luminous efficiency” is /ˈspɛktɹəl ˈluːmɪnəs ɪˈfɪʃənsɪ/.

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spectralˈspɛktɹəl
luminousˈluːmɪnəs
efficiency

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