Dusk to Dawn vs. Motion Detection
Dusk-to-dawn flood lights come on when the sun sets in the evening, and they stay on all night, or until their internal battery charge is depleted. They are an excellent option if you want to illuminate your property with continuous light. The downside of dawn-to-dusk solar lights is if the previous day was overcast or rainy, their batteries may not charge to maximum capacity. If this happens, the flood light may stay on only a few hours before it dims and goes out. Motion-detection flood lights turn on only when they sense motion, and they remain on for a predetermined amount of time, usually 20 to 30 seconds, before turning back off. Because motion-detection lighting uses less battery power, it is more likely to function all night long.
Charging and Run Time
Solar flood lights require ample sunlight to charge, usually six to eight hours for a full charge. Once charged, the battery will power the light for three to eight hours, depending on whether the flood light runs continuously or turns on only when it detects motion. Dusk-to-dawn solar lights require large-capacity batteries. They also usually have oversize solar panels, which enable them to draw and store as much solar energy as possible during the day so they can remain on all night long.
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☀ Note: If the sun is not enough, the battery may not be fully charged, so the lighting time and brightness will be affected.