"light gel" meaning in English

{
  "forms": [
    {
      "form": "light gels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "light gel (plural light gels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Photography",
          "orig": "en:Photography",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A thin sheet of colored plastic used to affect color temperature of lights when shooting film or video. They are held in front of a light by clipping it to the barn doors using C-47s."
      ],
      "id": "en-light_gel-en-noun-m6neCNo-",
      "links": [
        [
          "color temperature",
          "color temperature"
        ],
        [
          "barn doors",
          "barn doors"
        ],
        [
          "C-47",
          "C-47"
        ]
      ]
    }
  ],
  "word": "light gel"
}

{
  "forms": [
    {
      "form": "light gels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "light gel (plural light gels)",
      "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Photography"
      ],
      "glosses": [
        "A thin sheet of colored plastic used to affect color temperature of lights when shooting film or video. They are held in front of a light by clipping it to the barn doors using C-47s."
      ],
      "links": [
        [
          "color temperature",
          "color temperature"
        ],
        [
          "barn doors",
          "barn doors"
        ],
        [
          "C-47",
          "C-47"
        ]
      ]
    }
  ],
  "word": "light gel"
}