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Decoding California’s Title 24, Part 6

William Attardi on August 26, 2025

Commercial building energy codes regulate the design of nonresidential buildings to minimize energy consumption. While the majority of U.S. states adopt model codes and standards, the State of California developed its own code: Title 24, Part 6 of the state’s Building Standards Code. The latest version was released in 2025 and will take effect January 1, 2026. Title 24, Part 6 covers residential, nonresidential, high-rise residential, and hotel/motel buildings. Title 24, Part 6 contains robust, detailed lighting and control requirements. It requires a broad range of controls to ensure general lighting is turned Off or reduced when not needed.  .  For lighting, a number of changes have been made, mostly adjustments and clarifications. Decoding California’s Title 24, Part 6

CLTC’s 2022 Title 24, Part 6 Lighting Standards Videos

William Attardi on November 21, 2024

The California Lighting Technology Center is pleased to announce the release of its updated video series covering the 2022 Title 24, Part 6 lighting requirements. These videos aim to provide practical insights for implementing code-compliant lighting in both nonresidential and residential buildings across California. The video series features five segments, each focusing on a specific aspect of the 2022 Energy Code, effective January 1, 2023:

Telling Time – 12-hour time is a very ancient system that traces back to the Mesopotamian empires. They had a cultural fixation with the number 12, used a base-12 numerical system, and divided up most things into 12ths whenever possible – including day and night. The 12 hours of day and 12 hours of night system spread throughout Europe and the Middle East and has defied multiple attempts to change it over the centuries. Also, for anyone curious as to why there was such a love of the number 12, it was because that was how they counted on their hand. Look at your hand. Notice how each of your fingers minus your thumb has three easily identifiable parts to it. They used to count by using their thumb to count each part of the finger, much in the same way we count to 10 using our fingers today. So, 12 was the max you could count on one hand.