| Emergency Lighting - Functional Requirements |
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The functional requirement of a photoluminescent emergency lighting system is that 'specified features' in escape routes are visible from 10 metres. These specified features are defined to be stairs and landings, corridors and ramps, handrails, direction indicators, building elements that may act as obstructions, escape doors, and entries to a safe place. Photoluminescent products can also be used for emergency egress signage. Ecoglo products are tested in accordance with UL1994 (3) by an independent laboratory to ensure that they are visible from 10 metres, by a person with normal vision. This criterion is based on the New Zealand Building Code (4), the most stringent international test available, therefore allowing the safest outcome. The independent test also verifies that the products are visible from 10 metres when emitting a luminance output of 5 mcd/m2. The minimum design level for visibility of Ecoglo emergency products was therefore set at 5 mcd/m2. Exit signage can be provided to meet UL924 (5) or designed to meet local requirements. Electrical light can be used to charge photoluminescent products. Fluorescent light charging for 5 minutes at 150 lux ensures that the luminance output is above the design level of 5 mcd for 150 minutes after the main lighting has been turned off (see Visibility Duration tables). A longer duration of visibility can be achieved by charging for a longer duration and/or charging with a brighter source. Natural light is the most efficient source of UV and will fully charge Ecoglo photoluminescent material, even on the most overcast day. When fully charged Ecoglo products installed outdoors have luminance output above the design level of 5mcd/m2 for 12-15 hours depending on the climatic conditions. Step edge contrast meets appropriate Light Reflectance Value (LRV) difference or Luminance Contrast Value of the particular region (see tables here). Slip resistance meets the appropriate slip resistance test for the region (see tables here).
(3) UL 1994 Standard for Luminous Egress Path Marking Systems (4) New Zealand Building Code Clause F6 Visibility in Escape Routes has a 10m (32.8ft) requirement. In comparison the International Building Code Chapter 10 Means of Egress has a 25ft (7.62m) requirement. (5) UL 924 Standard for Emergency Lighting and Power Equipment
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