I'm sure that's right - although in the context of an extinction meter I'd suggest it probably indicates "artificial light".
Just out of interest, Mazda (properly Medha) is the Vedic word for "wise", part of the name of the principle of light (Ahura Mazda - "Lord of Wisdom") in Zoroastrianism. The founder of the bulb makers were followers of a fashionable mystical diet guru called Dr Otoman Ha'nish, who advocated self-denial and "special breathing" - a syttem he called Mazdaznan: they named the company after it!
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