ISO 22578-2:2024 PDF

Overview

ISO 22578-2:2024 specifies a laboratory test method for measuring the photopic luminance of phosphorescent materials used in natural disaster safety way guidance systems (SWGS). The standard defines how to prepare specimens, excite phosphorescent components, measure emitted light over time, and report results so products can be classified and marked consistently for safety signage and escape-route guidance.

Key topics and technical requirements

• Specimens and conditioning
  • Test three specimens representative of the production batch.
  • Each specimen must have at least a 35 mm phosphorescent area.
  • Pre-condition in complete darkness for at least 48 hours.
• Ambient and environmental conditions
  • Test and conditioning ambient: 23 °C ± 2 °C and 50 % ± 10 % relative humidity.
  • Measurement chamber light level must be at least one order of magnitude lower than the lowest expected luminance.
• Excitation
  • Excite specimens for 60 minutes using a xenon-arc source (mean irradiance ~400 mW/cm²) or 3 000 lx from a D lamp.
  • Uniform irradiance/illuminance across five test patches is required (max/min ratio