The fastest sorting question is usually: Does it happen when the light is supposed to be off, when it\u2019s on, or after it\u2019s been on for a while?<\/strong> That single answer narrows the search from a dozen possibilities to a few.<\/p> There\u2019s also a myth that drags people into expensive part roulette: \u201cJust swap the switch brand,\u201d or \u201cCheap LEDs are all the same now.\u201d The 2020\u20132021 returns counter reality in Phoenix didn\u2019t support that. The highest return-rate multipacks were the ones with shifting model numbers and factory codes in tiny print. Same box, \u201csame bulb,\u201d different driver behavior. Complaints clustered around sensors and dimmers: glow when off, flicker, buzz, early death. If the lamp\u2019s driver keeps changing, troubleshooting becomes a supply-chain problem, not an electrician problem.<\/p> The rule for the rest of this guide is blunt: label the symptom, then run one isolating test. After that, spend money.<\/p> A motion sensor wall switch isn\u2019t a dumb mechanical disconnect. Even when the light is \u201coff,\u201d the switch may still be powering its own electronics\u2014standby draw, sensing, logic\u2014depending on the model and wiring. This creates a tiny current path even when the human thinks the circuit is open.<\/p> This is where ghost glow comes from in a lot of Rayzeek + LED setups: that standby trickle current has to go somewhere. Some LED drivers behave like a little bucket (input capacitance) that can charge and discharge at micro-current levels. Some drivers interpret the trickle as a partial wake-up. The result is what the human sees at the lamp: a faint glow, an occasional pulse, or a shimmer only after timeout. In the Tempe condo hallway, the \u201cproof\u201d wasn\u2019t an argument about leakage current. It was one A19 swap showing that one driver design ignored the trickle while the bargain driver lit up on it.<\/p> Minimum load is the cousin of that story. Some electronic switches and controls behave better when the load has enough real draw to stabilize the control\u2019s electronics and the current path. Ultra-low wattage LED loads\u2014single lamps, 1\u20132 globe fixtures, vanity bars with tiny globes\u2014can sit right on the edge where the switch and driver can\u2019t agree on what \u201coff\u201d means.<\/p> In a Scottsdale bathroom remodel with a three-globe vanity bar, the problem showed up like a parting wink: a flash when the motion sensor timed out, and occasional shimmer in standby. A temporary resistive load added at the fixture stabilized the behavior instantly. That\u2019s not magic. That is a knob you can turn: load.<\/p> Two constraints matter here:<\/p> There\u2019s a popular explanation that tries to flatten all of this into \u201cit\u2019s always the neutral.\u201d Neutral problems are real, but ghost glow can occur even when a neutral exists and is properly connected\u2014because the switch is still doing something when it\u2019s \u201coff,\u201d and the LED driver is responding. The neutral story becomes relevant when symptoms cross circuits, change with other loads, or show up as heat, odor, or arcing. Those are stop-and-escalate signs, not \u201ctry a new bulb\u201d signs.<\/p>What a Motion Sensor Switch Is Doing When You Think It\u2019s Off<\/h2>
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