*3.1. Space Lighting*

Space lighting includes any type of lighting installed for the purpose of facilitating safe and pleasant nighttime activities and consists of security and road lighting. The Seoul light pollution prevention ordinance specifies the maximum vertical illuminance value for space lighting in each of the four light managemen<sup>t</sup> zones (illuminance is a measure of photometric flux per unit area or visible flux density. Illuminance is measured in either lux (lm/m2) or foot candles (lm/ft2) [17]). This facet of the ordinance mainly addresses light pollution, in the form of light trespass, intruding into enclosed areas at night. Table 2 shows permissible luminance values dictated by the Seoul light pollution ordinance.


**Table 2.** Permissible luminance values for space lighting.
