JA8 lighting stands for the “Joint Appendix 8” of Title 24, Part 6, which sets requirements for high efficacy light sources. JA8 applies to any residential construction project that requires a permit: single-family homes, multi-family homes up to three stories high, apartment units in residential high-rises, guest rooms in hotels and motels, and a few other niche applications. The JA8 definition of high efficacy lighting makes JA8 certification a gold standard of light quality: 3McA color consistency, color rendering index (CRI) > 90, red rendering index (R9) > 50, and <30% flicker in both dimmed and undimmed state. These requirements address how truly our lighting allows us to perceive color, as well as acknowledging the harmful health and safety effects associated with high levels of “invisible flicker”.
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