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I noticed outdoor LED lamps flickering too, but only at dusk, and for what I thought was a feedback issue. These lamps are solar powered and turn on at night.

The cool part is that at twilight, when the light turned on, the little bit of reflected light bounced back to the photovoltaics, adding just enough light to turn the light off, which brought the system full circle. Amazingly, this behavior only occured for about 1 minute each day.

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The normal solution to this is hysteresis. In most cases, it doesn't cost any extra to add hysteresis.

It does if you pay for a competent engineer in the first place who would know to do things like debounce switches and add hysteresis.

Thermostats would "flicker" this too if they didn't incorporate hysteresis. Hysteresis means the threshold at which the system transitions from OFF to ON is different from the threshold from ON to OFF.

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