A WELL AP is reviewing the color temperature of lights used for a regularly occupied...

According to the WELL v2™ feature L02: Visual Lighting Design, the project must provide visual comfort and enhance visual acuity for all users through electric lighting1. One of the design considerations for achieving this is to ensure illuminance uniformity on horizontal task planes, such as desks, tables, or counters, where visual tasks are performed2. Illuminance uniformity is the ratio of the minimum to the average illuminance on a given plane, and it indicates how evenly the light is distributed across the surface3. A high illuminance uniformity can prevent glare, contrast, or shadows that may impair visual comfort and performance4. Option A is incorrect, as CRI ≥ 90 in circulation areas is not a requirement for visual comfort, but rather for electric light quality, which is addressed by feature L081. Option C is incorrect, as luminance ratios on vertical adjacent zones are not a requirement for visual comfort, but rather for visual balance, which is addressed by feature L071. Option D is incorrect, as automatic changes in lighting characteristics over a period of five minutes are not a requirement for visual comfort, but rather for circadian lighting design, which is addressed by feature L031.

References: = Standard | WELL V2 - Feature L02: Visual Lighting Design Standard | WELL V2 - Feature L02: Visual Lighting Design - Part 1: Provide Visual Acuity For All Spaces Illuminance Uniformity - Lighting Research Center Lighting Design Basics - Mark Karlen, James R. Benya, and Christina Spangler