Illumination transition zone

Fire, exit, and life safety codes typically define minimum light levels for exits and exit routes. In some cases the minimum level is very low. That level may not be suUicient for transition zones where one experiences a sudden change in illumination. This is particularly true if the transition involves dark adaptation. The life safety and exit codes also have standards for emergency lighting. Other standards may offer minimum illumination levels for safety in general. Table 20 offers some recommendations for minimum illumination levels. 

---