CHOP CSH 3 & 4

CHOP Main Hospital | Patient-Care Floors 3 and 4 | Philadelphia, Pennsylvania

Watson served as the sole general contractor for CHOP’s Circadian Light Windows project, installing circadian lighting across occupied patient-care floors 3 and 4 of the hospital’s Main Campus.

Circadian lighting is designed to vary in color temperature and intensity throughout the day, creating an indoor lighting pattern that more closely reflects changes in natural daylight. In an inpatient environment, where patients may spend extended periods away from normal outdoor light, these changes can help reinforce the distinction between daytime activity and nighttime rest.

Although the project was limited in scale compared with a major clinical renovation, its location made the work highly sensitive. Installation occurred near occupied patient rooms and active care areas, where noise, access, dust, and interruptions had to be carefully controlled. Watson planned the work floor by floor and coordinated activities around clinical schedules, patient needs, staff movement, and required quiet periods.

The team established controlled work zones and sequenced installation so only limited areas were affected at a time. Materials, tools, and personnel had to move through the hospital without interfering with patient circulation or staff access. Daily communication with CHOP personnel helped the team respond to changing conditions on each floor.

The lighting installation also required coordination with existing ceilings, electrical infrastructure, controls, and surrounding building systems. Each completed area had to be checked and returned to service before work progressed to the next location, maintaining both quality and continuity throughout the installation.

This project illustrates how thoughtful construction can contribute directly to the patient experience. By integrating circadian lighting into active inpatient floors, CHOP enhanced the care environment without requiring broad disruption to the units where patients continued to receive treatment.

The CSH 3 & 4 Circadian Light Windows project demonstrates that active-facility discipline matters at every scale. Whether delivering a complex clinical expansion or a focused lighting improvement, Watson brings the same attention to planning, communication, safety, and the people occupying the space.

A carefully coordinated lighting upgrade designed around comfort, continuity, and the patient experience.