Choosing adequate lighting levels for different spaces and activities is crucial to ensure comfort, efficiency, and safety in any environment. Based on the guidelines from “The IES Illuminance Selector” book, in this article, we will explore how to determine suitable lighting according to the type of space and activities performed in it.

Understanding Illuminance Categories

Illuminance Categories According to IES

The IES Illuminance Selector classifies illuminances into three main categories:

  • Low illuminance (category A)
  • Medium illuminance (category B)
  • High illuminance (category C) These categories are based on the nature of tasks and visual accuracy required.

Factors Influencing Category Selection

When selecting the illuminance category, consider the following factors:

  • Age of occupants
  • Speed and precision required for the task
  • Reflections from surrounding surfaces

Identifying Space Type and Activities

Common Spaces and Activities

The IES Illuminance Selector provides illuminance recommendations for a wide variety of spaces and activities. Some examples include:

  • Offices
  • Schools
  • Hospitals
  • Restaurants
  • Retail stores
  • Sports facilities

Specific Tasks and Illuminance Requirements

Different tasks require different illuminance levels. For example:

  • Reading and writing tasks: medium to high illuminance
  • Navigation and orientation in a space: low to medium illuminance
  • Detailed visual tasks: high illuminance

Applying IES Illuminance Selector Recommendations

Examples of Illuminance Levels

Below are examples of illuminance recommendations for different spaces and activities according to the IES Illuminance Selector:

  • Living rooms: 50-200 lux (category A)
  • Offices with reading and writing tasks: 300-500 lux (category B)
  • Laboratories and workshops with detailed visual tasks: 750-1,000 lux (category C)

Adjusting Illuminance according to Specific Needs

Although the IES Illuminance Selector provides an excellent guide, it is important to adapt recommendations to specific needs of your space and occupants.