UNSPSC 32151503: Stack Light

UNSPSC 32151503 Stack Light, a Commodity code, addresses visual and auditory signaling devices used in industrial control environments, though recent state and local procurement activity under this code shows minimal direct solicitation for stack lights themselves. Instead, the code appears tagged to broader control system modernization and integration projects where stack lights function as subordinate components within supervisory control and data acquisition (SCADA) upgrades, programmable logic controller (PLC) replacements, and facility automation work. The actual work being solicited involves comprehensive industrial controls system replacements at water treatment plants, wastewater facilities, and utility infrastructure, where signaling and indication devices support operational status monitoring and alarm management as part of end-to-end system deployment.

State and local issuing bodies pursuing work under this code include municipal water authorities and transportation agencies. The City of Atlanta has posted two pre-advertisement notices for substantial SCADA modernization projects at the Hemphill and Chattahoochee water treatment plants (both issued May 8, 2026, with response deadlines of May 29, 2026), each involving replacement of General Electric iFix SCADA systems with Schneider Electric AVEVA platforms, conversion to Ethernet/IP architecture, and installation of new ControlLogix controllers and operator interface terminals across multiple process areas. The City of Santa Fe, on behalf of the Buckman Direct Diversion, issued RFP FY26-RFP-036 (posted February 9, 2026) for PLC replacement and SCADA modifications targeting four critical controllers using Schneider Electric Unity Pro XL software. Geographic activity centers on Georgia and New Mexico, with additional procurement signals from Florida and California. Vendors responding to these opportunities typically bundle stack light installation and integration as part of larger control panel and indicator system deployments rather than as standalone products, and qualification requirements emphasize five or more years of experience completing comparable end-to-end SCADA and PLC integration projects at water or wastewater treatment facilities.