Commission endorses staff research and asks to adopt La Mirada‑style residential lighting rules with motion‑sensor limits

Planning staff presented research on municipal approaches to light spillage and nuisance lighting and recommended language modeled primarily on La Mirada with a supplemental Palo Alto motion‑sensor provision. Staff recommended avoiding overly technical lumen‑based standards for single‑family contexts and instead using directed/shielded and visibility‑based tests that protect dwellings from intrusive light.

As staff described it, possible language would require outdoor lighting to be directed and shielded so it “does not constitute a nuisance to an abutting residential property” and to require that motion sensor lighting “must extinguish after no more than 5 minutes without further activation.” The commission discussed off‑hour cutoffs (staff recommended not using a rigid 11 p.m. to 6 a.m. prohibition) and agreed the goal is to allow reasonable residential lighting for safety while limiting intrusions. Commissioners asked that code‑enforcement discretion and objective standards (shielding so the light source is not visible inside a residence) both be part of the draft.

The commission supported staff’s direction to combine La Mirada’s practical language on nuisance and shielding with Palo Alto’s motion‑sensor timing rule and to return the combined language in the package of development‑standard changes.