ISO 15727:2020

Overview

ISO 15727:2020 - "UV‑C devices - Measurement of the output of a UV‑C lamp" specifies standardized methods for measuring the UV‑C output of linear UV‑C disinfection lamps, with emphasis on lamps installed in HVAC systems and UVGI (ultraviolet germicidal irradiation) devices. The standard defines lamp types, ballast types, measurement environments (darkroom and test chamber), and safety considerations to enable reliable, comparable assessments of UV‑C irradiance and output power.

Key topics and technical requirements

• Scope and applicability
  • Measurement of output power for linear UV‑C disinfection lamps, including simulation of HVAC conditions.
  • Comparison and evaluation of UV‑C output under variable temperatures and air velocities, and with the lamp axis parallel or perpendicular to airflow.
• Types of lamps and ballasts
  • Distinguishes medium‑pressure and low‑pressure UV‑C lamps (low‑pressure commonly used for air disinfection).
  • Describes linear UV‑C lamps (end‑connector types) and ballast types: magnetic and electronic.
• Measurement methods
  • Procedures for darkroom measurements and test chamber measurements (normative annex included).
  • Use of calibrated UV‑C radiometers and requirements for instrument calibration, measurement geometry, and UV‑C power calculation.
  • Simulation parameters: various temperatures, air velocities, and orientation relative to airflow to reflect real HVAC conditions.
• Performance metrics
  • Reporting of UV‑C irradiance and UV‑C radiation conversion efficiency (note: low‑pressure lamps typically show conversion efficiency ranges discussed in the standard).
• Safety requirements
  • Guidance on personal protective equipment (PPE), protective clothing and eyewear, ozone production, mercury content, photodegradation of organics, and leakage control.
  • Cross‑references to exposure safety standard ISO 15858.

Practical applications - who uses ISO 15727

• HVAC and building engineers evaluating or specifying UV‑C lamps for in‑duct air disinfection.
• UVGI device manufacturers validating lamp output and demonstrating performance across operating conditions.
• Testing and calibration laboratories (ISO/IEC 17025 accredited) performing repeatable UV‑C output measurements.
• Facility managers, public health professionals, and procurement teams assessing comparative efficacy of UV‑C solutions.
• Researchers studying microbial inactivation where known device inactivation rates can be extrapolated across temperatures and flow rates using measured lamp output.

Related standards

• ISO 15858 - UV‑C Devices - Safety information - Permissible human exposure
• ISO 29464:2017 - Cleaning of air and other gases - Terminology
• ISO/IEC 17025 - Competence of testing and calibration laboratories
• CIE S 017 - International lighting vocabulary

ISO 15727 provides a practical, standardized framework for measuring UV‑C lamp output so stakeholders can reliably compare devices, evaluate in‑duct performance, and estimate UVGI microbial inactivation under realistic HVAC conditions. Keywords: ISO 15727, UV‑C lamp measurement, UVGI, HVAC disinfection, UV‑C radiometer, irradiance, ballast, linear UV‑C lamp.