86 lines
3.2 KiB
YAML
86 lines
3.2 KiB
YAML
id: https://nde.nl/ontology/hc/slot/max_annual_light_exposure
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name: max_annual_light_exposure_slot
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title: Maximum Annual Light Exposure Slot
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description: 'Maximum acceptable cumulative annual light exposure in lux-hours.
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**ISO STANDARD REFERENCE VALUES**:
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- EN 16893:2018 (High sensitivity): <15,000 lux-hours/year
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- EN 16893:2018 (Medium sensitivity): <150,000 lux-hours/year
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- CIE 157:2004 (Textiles): <12,000 lux-hours/year
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- ASHRAE Guidelines: <50,000 lux-hours for sensitive materials
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**CUMULATIVE EXPOSURE EXAMPLES** (at 50 lux):
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- 8 hours/day, 250 days/year = 100,000 lux-hours
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- 4 hours/day, 250 days/year = 50,000 lux-hours
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**PRESERVATION CONTEXT**:
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Light damage follows the reciprocity law (Bunsen-Roscoe law): total exposure
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matters, not intensity alone. Annual limits ensure rotating displays and
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controlled access periods for highly sensitive materials.
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'
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prefixes:
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linkml: https://w3id.org/linkml/
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hc: https://nde.nl/ontology/hc/
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qudt: http://qudt.org/schema/qudt/
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quantitykind: http://qudt.org/vocab/quantitykind/
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qudt_unit: http://qudt.org/vocab/unit/
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sosa: http://www.w3.org/ns/sosa/
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ssn: http://www.w3.org/ns/ssn/
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crm: http://www.cidoc-crm.org/cidoc-crm/
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wd: http://www.wikidata.org/entity/
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schema: http://schema.org/
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dcterms: http://purl.org/dc/terms/
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prov: http://www.w3.org/ns/prov#
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skos: http://www.w3.org/2004/02/skos/core#
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rdfs: http://www.w3.org/2000/01/rdf-schema#
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org: http://www.w3.org/ns/org#
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xsd: http://www.w3.org/2001/XMLSchema#
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imports:
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- linkml:types
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default_prefix: hc
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slots:
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max_annual_light_exposure:
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description: "Maximum acceptable cumulative annual light exposure in lux-hours per year.\n\nBased on preservation standards:\n- High sensitivity (EN 16893): <15,000 lux-hours/year\n- Medium sensitivity (EN 16893): <150,000 lux-hours/year\n- Textiles (CIE 157): <12,000 lux-hours/year\n- General guidance (ASHRAE): <50,000 lux-hours/year\n\nLight damage is cumulative (reciprocity law). Annual limits mandate:\n- Rotating displays for sensitive works\n- Controlled access periods\n- Dark storage between exhibition periods\n\nExample: 50 lux \xD7 8 hours/day \xD7 250 days = 100,000 lux-hours (too high!)\n"
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range: float
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slot_uri: hc:maxAnnualLightExposure
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close_mappings:
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- sosa:ObservableProperty
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- crm:E54_Dimension
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related_mappings:
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- quantitykind:LuminousExposure
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- wd:Q194411
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- schema:maxValue
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minimum_value: 0.0
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maximum_value: 500000.0
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see_also:
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- https://www.nen.nl/en-16893-2018-en-274167
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- https://cie.co.at/publications/control-damage-museum-objects-optical-radiation
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examples:
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- value: 12000.0
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description: Maximum for textiles (CIE 157)
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- value: 15000.0
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description: Maximum for highly sensitive materials (EN 16893)
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- value: 50000.0
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description: General guidance for sensitive materials (ASHRAE)
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- value: 150000.0
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description: Maximum for moderately sensitive materials (EN 16893)
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annotations:
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qudt_unit: unit:LUX-HR
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ucum_code: lx.h
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iso_reference: EN 16893:2018, CIE 157:2004
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preservation_parameter: 'true'
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calculation_note: "lux-hours = illuminance (lux) \xD7 exposure time (hours)"
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custodian_types: '["*"]'
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