Light quality measurement

Light quality measurement ?

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Light Quality Measurement Services and Systematic Solutions for a Better Work Environment and Reduced Impact on Work Systems

Measuring workplace lighting is essential to ensure that light intensity meets safety standards for workers. Different work areas require different lighting standards based on the nature of the work performed. The standard lighting levels in workplaces must not be lower than the legal requirements.

Beyond measuring light intensity, workplace lighting assessments also play a role in monitoring workers’ health.

Lighting directly affects vision—too little or too much light can impact workers’ health. According to the Ministerial Regulation on Occupational Safety, Health, and Working Environment Standards Related to Heat, Lighting, and Noise B.E. 2559 (2016), the legal definitions and requirements for workplace lighting are specified to ensure safety and efficiency.

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“Illuminance” means the amount of light that falls on a unit area per square meter. In this regulation, the unit of illuminance is measured in lux (LUX).

1. Frequency of Light Measurement

According to the Ministerial Regulation on Occupational Safety, Health, and Working Environment Standards Related to Heat, Lighting, and Noise B.E. 2559 (2016), workplace lighting must be measured and analyzed at least once per year. Additionally, if there are modifications to machinery, equipment, production processes, or work methods that may alter light intensity, new measurements must be conducted to ensure compliance with legal requirements.

If lighting levels do not meet the required standards, corrective actions must be taken immediately to ensure worker safety. Some workplaces may conduct inspections every six months to monitor lighting conditions, as the efficiency of light sources can degrade over time.

2. Key Areas for Light Measurement

All types of businesses must measure light intensity in the following areas:

  • General areas and production areas: Measurements should be taken at 75 cm above the floor.
  • Emergency routes and general traffic areas: Measurements should be taken along the walking surface.
  • Workstations requiring visual focus: Measurements should be taken at the point where the worker’s eyes focus on the task or object.

In some cases, measurement values must be calculated according to standard formulas before they can be used. These values must then be compared to the Department of Labor Protection and Welfare’s Standards on Light Intensity to ensure legal compliance.

3. Who Can Conduct Light Measurements?

  • If a workplace has a Certified Occupational Safety Officer (Professional Level) registered with the Department of Labor Protection and Welfare, they may conduct the measurements.
  • The measuring instruments must meet specified standards.
  • If the company cannot conduct its own measurements, it must hire a registered third-party professional under Section 9 or a licensed entity under Section 11 of the Occupational Safety, Health, and Working Environment Act B.E. 2554 (2011).

4. Light Measurement Standards

The measuring equipment must meet the following international and national standards:

  • CIE 1931 – International Commission on Illumination (CIE)
  • ISO/CIE 10527 or equivalent standards such as JIS

Before measurement, the light meter must be calibrated to zero (Photometer Zeroing). Measurements should be taken under normal working conditions and when natural light is at its lowest.

5. Legal Safety Measures

The Ministerial Regulation on Occupational Safety, Health, and Working Environment Standards Related to Heat, Lighting, and Noise B.E. 2559 (2016) outlines several legal obligations:

  • Section 4: Employers must ensure workplace lighting meets the minimum standards set by the Department of Labor Protection and Welfare.
  • Section 5: Employers must implement measures to prevent direct or reflected glare from artificial or natural light sources. This may include using light filters, screens, or other protective measures. If glare cannot be prevented, workers must use personal protective equipment (PPE), such as anti-glare glasses or face shields.
  • Section 6: For work in dark, enclosed, or confined spaces (e.g., tunnels, caves, or enclosed areas), employers must provide suitable lighting equipment. If this is not possible, workers must wear helmet-mounted lights or other personal lighting devices.

Summary

Lighting is a critical factor in workplace safety. Employers must maintain light intensity within legal limits, conduct measurements at least once per year, and reassess lighting whenever there are changes in equipment or work environments. Additionally, worker health assessments may be required if exposure to improper lighting conditions poses a risk.

Relevant Laws and Regulations

  1. Ministerial Regulation on Occupational Safety, Health, and Working Environment Standards Related to Heat, Lighting, and Noise B.E. 2559 (2016)
  2. Department of Labor Protection and Welfare Announcement on Light Measurement and Analysis Methods
  3. Department of Labor Protection and Welfare Announcement on Light Intensity Standards

Services of One More Link

One More Link Co., Ltd. provides professional light quality measurement services and systematic lighting solutions to improve workplace environments and minimize work-related impacts. We are ISO 9001 and ISO 14001 certified, ensuring compliance with international standards and full legal accountability. Our processes are transparent, verifiable, and legally compliant at every step.

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