id: https://nde.nl/ontology/hc/slot/max_light_lux
name: max_light_lux_slot
title: Maximum Light Level (Lux) Slot
description: "Maximum acceptable light level in lux for an environmental storage zone.\n\n**ISO STANDARD REFERENCE VALUES**:\n- ISO 11799:2015 (Archives): <50 lux for paper/parchment\n- EN 16893:2018 (Museums): <50 lux for highly sensitive materials\n- EN 16893:2018 (Museums): <200 lux for moderately sensitive\n- BS 4971:2017 (UK): 0 lux for storage, <50 lux access\n\n**SENSITIVITY CATEGORIES**:\n- High sensitivity (<50 lux): Paper, photographs, textiles, watercolors\n- Medium sensitivity (<200 lux): Oil paintings, wood, leather\n- Low sensitivity (<300 lux): Stone, ceramics, most metals\n\n**PRESERVATION CONTEXT**:\nLight damage is cumulative and irreversible. Total exposure (lux \xD7 hours)\ndetermines damage, following the reciprocity law. Fading, yellowing, and\nembrittlement result from photochemical degradation.\n"
prefixes:
  linkml: https://w3id.org/linkml/
  hc: https://nde.nl/ontology/hc/
  qudt: http://qudt.org/schema/qudt/
  quantitykind: http://qudt.org/vocab/quantitykind/
  qudt_unit: http://qudt.org/vocab/unit/
  sosa: http://www.w3.org/ns/sosa/
  ssn: http://www.w3.org/ns/ssn/
  crm: http://www.cidoc-crm.org/cidoc-crm/
  wd: http://www.wikidata.org/entity/
  schema: http://schema.org/
  brick: https://brickschema.org/schema/Brick#
  dcterms: http://purl.org/dc/terms/
  prov: http://www.w3.org/ns/prov#
  skos: http://www.w3.org/2004/02/skos/core#
  rdfs: http://www.w3.org/2000/01/rdf-schema#
  org: http://www.w3.org/ns/org#
  xsd: http://www.w3.org/2001/XMLSchema#
imports:
- linkml:types
default_prefix: hc
slots:
  max_light_lux:
    description: "Maximum acceptable light level in lux (lumens per square meter).\n\nBased on ISO/EN preservation standards:\n- Archives (ISO 11799): <50 lux for paper/parchment\n- High sensitivity (EN 16893): <50 lux (textiles, watercolors, photos)\n- Medium sensitivity (EN 16893): <200 lux (oil paintings, leather)\n- Low sensitivity (EN 16893): <300 lux (ceramics, stone, metals)\n- UK Storage (BS 4971): 0 lux for closed storage\n\nLight damage is cumulative and irreversible. Damage follows the\nreciprocity law: 50 lux \xD7 8 hours = 400 lux \xD7 1 hour (same damage).\n"
    range: float
    slot_uri: hc:maxLightLux
    close_mappings:
    - sosa:ObservableProperty
    - crm:E54_Dimension
    - brick:Illuminance_Sensor
    related_mappings:
    - quantitykind:Illuminance
    - wd:Q194411
    - schema:maxValue
    minimum_value: 0.0
    maximum_value: 500.0
    see_also:
    - https://www.iso.org/standard/63810.html
    - https://www.nen.nl/en-16893-2018-en-274167
    examples:
    - value: 0.0
      description: Dark storage - zero light exposure
    - value: 50.0
      description: Maximum for highly sensitive materials (paper, textiles)
    - value: 200.0
      description: Maximum for moderately sensitive materials (oil paintings)
    - value: 300.0
      description: Maximum for low sensitivity materials (ceramics, metals)
    annotations:
      qudt_unit: unit:LUX
      ucum_code: lx
      iso_reference: ISO 11799:2015, EN 16893:2018, BS 4971:2017
      preservation_parameter: 'true'
      sensitivity_thresholds: 'high_sensitivity: 50 lux

        medium_sensitivity: 200 lux

        low_sensitivity: 300 lux

        '
      custodian_types: '["*"]'