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The sightline check isn’t mystical. Stand under the sensor and trace the likely detection zone. Then look for the recurring offenders: a supply vent blowing across the sensor field, a doorway that frames corridor motion, a glass office front that turns hallway traffic into false triggers, a warm copier changing the room\u2019s background, or partitions blocking the movement that actually happens.<\/p>
Restrooms are the clearest reminder that placement is not decorative. A two\u2011stall restroom in San Jose, CA had a sensor centered above the stalls because it looked symmetrical. It also produced the worst possible failure mode: lights going out while someone was still in a stall. This escalated to HR and a demand to disable sensors until re\u2011commissioned. The repair wasn’t a clever setting; it required moving coverage toward the entry zone and assigning a conservative timeout so stillness wasn’t punished. That fix required patch\/paint and a ceiling tile swap, but it was still cheaper than the reputational damage.<\/p>
Coverage varies across installs. Mounting height, lens pattern, and room geometry change the real detection pattern enough that commissioning cannot be done from a desk. A minimum checklist to prevent “mystery” behavior looks like this:<\/p>
- Identify cross\u2011traffic sources:<\/strong> Glass sidelights, open doors, corridor adjacency.<\/li>\n\n
- Identify airflow or thermal oddities:<\/strong> Supply vents, sun patches, warm equipment.<\/li>\n\n
- Identify where people are still:<\/strong> Conference seats, desk chairs, restroom stalls.<\/li>\n\n
- Decide the first move:<\/strong> Is it aim\/masking\/relocation rather than parameter changes? Settings are second\u2011order until the physical setup is sane.<\/li><\/ul>
Three Profiles That Usually Survive Real Offices<\/h2>
A suite with ten different occupancy behaviors does not need ten different configurations. It needs a small number of profiles that a future facilities person can understand quickly, and a commissioning tech can revert to without guessing.<\/p>
Documentation habits matter here because small office suites churn: tenants change, furniture moves, and the person who “knows the settings” leaves. A full closeout binder can exist in a SharePoint folder named
TI_2022_Lighting<\/code> and still be functionally invisible. What survives is a one\u2011page “Room Type \u2192 Profile” map forwarded in an email thread, or taped inside the lighting panel door if policy allows.<\/p>These profiles are behavioral targets, not universal Rayzeek DIP switch recipes, because models and firmware differ (DIP banks vs app parameters). Crosswalk these intents to the exact options in the installation manual for the model on the ceiling.<\/p>
Profile A: “People Work Here” (stillness-tolerant)<\/h3>
This is the default for private offices and conference rooms unless there is a strong reason to treat them differently. The assumption is simple: a person can be present and productive with very little motion. The timeout needs to be long enough to survive a seated meeting or a long video call, and detection needs to prioritize the seated zone, not the doorway.<\/p>
Build this profile around stillness risk. In private offices, the “Zoom stillness” posture is real: facing a monitor, hands on the desk, minimal movement for minutes at a time. If the sensor is aimed at the door rather than the chair\u2014or if the office has a glass sidelight and the door is often left slightly ajar\u2014the temptation is to increase sensitivity until micro\u2011motion is detected. That often turns into corridor bleed and random ons.<\/p>
A safer pattern: ensure the sensor can “see” the chair zone, extend timeout to cover the stillness window, and only consider sensitivity changes if the aim and bleed are already under control.<\/p>
Conference rooms deserve a note because their failure cost is disproportionate. The Fremont incident\u2014lights dropping mid\u2011meeting with execs and auditors\u2014wasn’t solved by chasing detection with higher sensitivity. It was solved by acknowledging the room\u2019s job: protect meetings. That usually means a longer timeout than the rest of the suite, plus a sensitivity level that ignores hallway chatter through a glass sidelight. A conference room that turns on when someone walks past the glass isn’t “more advanced.” It feels unpredictable.<\/p>
Profile B: “Dignity Settings” (restrooms and HR-sensitive spaces)<\/h3>
Restrooms are not a place to be clever. The rule that tends to reduce complaint risk is blunt: restrooms get longer timeouts and forgiving behavior, even if the energy manager wants to treat them as easy savings.<\/p>
The reason is social, not technical. In the San Jose two\u2011stall case, one lights\u2011out event in a stall became a story that spread and forced an emergency re\u2011commissioning. The energy penalty from a longer restroom timeout is usually small compared to the cost of disabling sensors entirely after a backlash. This profile also has a placement bias: avoid coverage blocked by 7\u2011foot stall partitions, avoid centering over stalls “for symmetry,” and prioritize coverage near the entry and the movement patterns people actually make.<\/p>
If someone searches for “bathroom sensor embarrassing” or “restroom occupancy sensor keeps turning off,” the correction isn’t a lecture about PIR. The correction is treating the restroom as a high\u2011stakes human space, commissioning it conservatively, and validating it with an honest stillness test.<\/p>
Profile C: “Burst Rooms and Transit” (copy rooms, storage, corridors)<\/h3>
This is where aggressive energy savings can be done with less social risk\u2014provided cross\u2011traffic bleed is managed first. Copy rooms, storage rooms, and corridors are usually “enter, do a short task, exit.” They aren’t designed for stillness. A shorter timeout is often appropriate, but only after the sensor stops triggering on the wrong people in the wrong place.<\/p>
A Portland, OR copy room shows the common failure mode. The door was routinely propped open with a wedge during busy periods, and the sensor had a sightline to hallway motion through that opening. People complained the copy room was “always on,” and the first proposed fix was to shorten the timeout. That would have made the room worse during real use: people print, wait, collate, and stand relatively still for short stretches. The effective fix was to stop the hallway bleed (aim\/masking and door behavior), then set a timeout that turns the room off quickly after a true exit without punishing the 60\u2013120 seconds of print wait.<\/p>
Corridors add the after\u2011hours layer. In an Oakland, CA suite, corridor lights were repeatedly on early in the morning. The cleaning crew had a predictable 6\u20139 pm window and a loop pattern: trash, wipe, move on, repeat. With generous timeouts and glass office fronts, intermittent motion kept re\u2011triggering the corridor. The tenant didn\u2019t report it as a “comfort complaint” at first; it showed up as an energy optics problem when utility bills were compared month\u2011over\u2011month. In transit spaces, shorter timeouts and tighter control of bleed are usually a safer place to be aggressive than in desks, meetings, or restrooms.<\/p>
Exceptions (kept small on purpose)<\/h3>
Exceptions should be earned and documented, not improvised. A server room with infrequent entry might want a different behavior. A copy room next to a high\u2011traffic corridor might need masking that other rooms don\u2019t. The rule that keeps suites maintainable is: keep exceptions few, write down why they exist, and keep a rollback path to the profile baseline.<\/p>
A suite that “works” today but cannot be explained six months later will get reset to defaults by the next person under pressure. Profiles are a defense against that.<\/p>
The Knobs That Matter (and the Order to Touch Them)<\/h2>
Most commissioning thrash happens because changes are made out of order. To reduce callbacks, follow this sequence: sightline\/aim\/masking first, timeout second, sensitivity third, and mode policy (occupancy vs. vacancy) as a deliberate decision rather than a patch.<\/p>
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- Identify airflow or thermal oddities:<\/strong> Supply vents, sun patches, warm equipment.<\/li>\n\n