9.2.4 Lighting System | Chicago Public Schools

The minimum illumination (foot candle) levels shall be based on the IESNA guidelines and CPS standards. The AOR shall provide calculations showing the lighting levels in all areas no later than at the 60% design review. See the Lighting Levels Table in Appendix A for specific desired illumination.
Foot-candle calculation shall be developed by the EOR using the room cavity ratio method with the work plane surface being 30 inches above the floor. Ceiling, wall, and floor material reflectance shall be verified and incorporated into lighting power density and spatial daylight autonomy calculations.
Manage brightness such that main rooms and surfaces do no exhibit 10 times greater or lesser luminance than ancillary space and remote surfaces respectively, and surfaces do not exhibit 3 times greater or lesser luminance than adjacent surfaces.

Interior lighting power allowance of all projects must comply with section C405.3 of IECC 2018 by either the Building Area Method (C405.3.2.1) or the Space by Space Method (C405.3.2.1). To comply with either of these paths, the design must not exceed the listed densities in the tables below based on the path selected.
Building Area Method - Table C405.3.2(1)
Space by Space Method - Table C405.3.2(2)
The connected exterior lighting power allowance of all projects must comply with section C405.4 of IECC 2018. Design must not exceed the listed densities in IECC 2018 Table C405.4.2(2).
For projects pursuing LEED, in addition to complying with IECC 2018, the lighting power density must also comply with ASHRAE 90.1-2010 Chapter 9. Chapter 9 allows for the same compliance paths listed above.
Building Area Method - Table 9.5.1
Space by Space Method - Table 9.6.1
Exterior - Table 9.4.3B

Light Sources shall be LED
LED modules shall generally be 3500 Degrees K with CRI of 80 or greater with R9 greater than 50, or at least 90 when available.
LED lamps shall have a “low risk” level of flicker (light modulation) of less than 5%, especially below 90 Hz operation as defined by IEEE standard 1789-2015 LED.
LED drivers shall be 0-10V dimmable to 1% or 10% standard, as required by the application and shall be tested as a pair with the lighting control system.
For at least 75% of the total connected lighting load, use light sources that have a L70 of at least 24,000 hours (at 3-hour per start, if applicable).
Refer to CPS Standard Specifications Section 26 51 00 for Interior Lighting Fixtures and 26 56 00 for Exterior Lighting Fixtures.

Interior corridor lighting shall be controlled by a time clock and local/automatic controls via the lighting control system or zone controller. Changes is light levels shall be carried out over the span of at least 30 minutes in steps or with a smooth transition.
Light fixtures shall be controlled by control stations and room controllers on a per room basis where fixtures are in accordance with individual control schemes outlined in the room level section. Circuit breakers will not be acceptable for turning lighting “on” and “off”.
All areas (including those with occupancy sensors) shall have lighting controls which comply with IECC most current revision. The lighting control system shall be capable of interfacing with the BAS.

Wireless type systems are not allowed without project approval from CPS and CPS ITS.

Provide daylight zoning and controls to turn off or dim electric lights when spatial daylight autonomy is achieved (sDA300,50 %).
Lighting controls to be integrated to the BAS using industry standard methods.
Provide lighting controls that enable occupants to adjust the lighting to suit their individual tasks and preferences, with at least three lighting levels or scenes (on, off, and midlevel). Mid Level is 30% to 70% of the maximum illumination level (not including daylight contributions).
For all shared occupant spaces, meet all of the following requirements:

Provide multi zone control systems that enable occupants to adjust the lighting to meet group needs and preferences, with at least three lighting levels or scenes (on, off, midlevel).
Lighting for any presentation or projection wall must be separately controlled.
Lighting control devices must be located in the same space as the controlled luminaires. A person operating the controls must have a direct line of sight to the controlled luminaires.

For rooms that require emergency lighting and dimming controls, when the building utilizes a generator or inverter for emergency lighting power, emergency fixtures shall dim along with the other fixtures in the space based on the lighting control setting. Lighting controls shall be UL924 listed for control of emergency lighting. If normal power is lost, all emergency lighting fixtures must come on to 100% regardless of control setting.