"lumen second" meaning in English

{
  "forms": [
    {
      "form": "lumen seconds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "lumen second (plural lumen seconds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Russian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A derived SI unit of luminous energy."
      ],
      "id": "en-lumen_second-en-noun-T~WpAb~K",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "SI",
          "SI"
        ]
      ],
      "raw_glosses": [
        "(physics) A derived SI unit of luminous energy."
      ],
      "synonyms": [
        {
          "alt": "mks",
          "word": "talbot"
        },
        {
          "word": "lumen-second"
        },
        {
          "word": "lumensecond"
        }
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "translations": [
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "ljúmen-sekúnda",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "лю́мен-секу́нда"
        }
      ]
    }
  ],
  "word": "lumen second"
}

{
  "forms": [
    {
      "form": "lumen seconds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "lumen second (plural lumen seconds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Terms with Russian translations",
        "Translation table header lacks gloss",
        "en:Physics"
      ],
      "glosses": [
        "A derived SI unit of luminous energy."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "SI",
          "SI"
        ]
      ],
      "raw_glosses": [
        "(physics) A derived SI unit of luminous energy."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "synonyms": [
    {
      "alt": "mks",
      "word": "talbot"
    },
    {
      "word": "lumen-second"
    },
    {
      "word": "lumensecond"
    }
  ],
  "translations": [
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "ljúmen-sekúnda",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "лю́мен-секу́нда"
    }
  ],
  "word": "lumen second"
}