California’s Title 24, Part 6, also known as the Building Energy Efficiency Standards, sets strict requirements for lighting in nonresidential buildings. For architects, engineers, and facility managers, achieving Title 24 compliance is not optional—it is mandatory for permit approval. This guide focuses on the 2025 update’s key lighting provisions.

First, the code mandates auto shut-off controls. All luminaires in spaces larger than 250 square feet must be controlled by an occupancy sensor or a time-switch with a seven-day clock. Manual overrides are permitted but must revert to automatic control within 20 minutes. In open-plan offices, sensors must cover areas no larger than 600 square feet for reliable detection.

Second, lighting power density (LPD) allowances have decreased. For example, a typical office cannot exceed 0.8 watts per square foot, while a retail sales floor is capped at 1.2 W/ft². Manufacturers must provide luminaire-level lighting control that responds to daylight. Skylighted zones require dimming to 50% or less when sufficient daylight is available.

Third, outdoor lighting must meet strict lumen-per-watt thresholds. Parking lot fixtures must be at least 70 lumens per watt, and all outdoor luminaires must include a shut-off function that turns off lights during daylight hours. Additionally, building facades and landscape lighting are limited by a total site-wattage budget.

To simplify compliance, designers often use the “prescriptive approach” by selecting only certified high-efficacy LED products listed in the Title 24 Reference Appendices. Alternatively, the “performance approach” allows trade-offs through energy modeling with software like EnergyPro.

Noncompliance carries serious consequences: failed inspections, delayed certificates of occupancy, and costly rework. Therefore, it is advisable to involve a certified commissioning agent early to verify that all controls function as designed.

By integrating daylight harvesting, occupancy sensing, and low-wattage LED technology, project teams can achieve Title 24 compliance while reducing energy costs by 30% or more. For California buildings, these standards not only meet legal requirements but also support the state’s goal of carbon neutrality by 2045.