ISO 8995-1:2002

Overview

ISO 8995-1:2002 - Lighting of work places, Part 1: Indoor is an international standard (published jointly with CIE as CIE S 008/E) that specifies lighting requirements for indoor workplaces to enable people to perform visual tasks efficiently, comfortably and safely throughout the work period. The standard sets performance criteria (maintained illuminances, glare limits, colour quality and other luminous-environment parameters) but does not provide detailed lighting-design methods - designers should consult relevant CIE guides and reports for system design.

Key topics and technical requirements

• Illuminance: Recommended maintained illuminances for task areas and immediate surroundings; values are given per task type and must not fall below the specified averages.
• Luminance distribution: Guidance on balanced luminance in the field of view to support adaptation, acuity and contrast sensitivity. Typical interior surface reflectance ranges are given (ceiling 0.6–0.9, walls 0.3–0.8, working planes 0.2–0.6, floor 0.1–0.5).
• Glare control: Use of Unified Glare Rating (UGR) and limiting UGR values to avoid discomfort glare; shielding-angle and luminaire luminance considerations.
• Colour aspects: Minimum Colour Rendering Index (Ra) requirements and attention to colour appearance (Tcp) for tasks where accurate colour perception matters.
• Directionality & modelling: Directional lighting and modelling recommendations for tasks requiring three-dimensional perception.
• Daylight & integration: Role of daylight in indoor lighting and interaction with electric lighting.
• Other parameters: Maintenance factors, energy considerations, flicker and stroboscopic effects, VDT (visual display terminal) workstation lighting, and emergency lighting.
• Verification procedures: Measurement and verification methods for illuminance, UGR, colour rendering, luminaire luminance and maintenance.

Applications and who uses it

ISO 8995-1:2002 is used by:

• Lighting designers and electrical engineers for specifying performance criteria in indoor lighting projects
• Architects and interior designers to coordinate luminance distribution and surface reflectances
• Facility managers and maintenance planners to set maintenance illuminance targets and replacement cycles
• Occupational health & safety officers and ergonomists for workplace compliance and visual ergonomics
• Procurement teams and spec writers when selecting luminaires and light sources to meet UGR and CRI requirements

Practical uses include office lighting, industrial workstations, educational facilities, healthcare interiors and any indoor environment where visual tasks and worker safety are critical.

Related standards

• ISO 9241 (ergonomics for VDT workstations)
• ISO 6385 (ergonomic principles)
• CIE 117 (discomfort glare) and CIE 13.3 (colour rendering)
• CIE guides and calculation reports for lighting design methods

Keywords: ISO 8995-1:2002, indoor lighting, workplace lighting standards, illuminance, unified glare rating, colour rendering, luminance distribution, lighting design, visual tasks.