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Ashialight LED Dusk to Dawn Bulb Safety and Security: Built-in light sensor turns the bulb on at dusk and off at dawn Energy Efficient and extra-long life.: Replaces a 60W incandescent light bulb and last up to 10X longer than incandescent and halogen bulbs. Left the light switch on permanently and the light has been turning on at dusk and shutting off at dawn. Clouds or overcast weather conditions don't affect it, On a really dark stormy day, it might also come on while the dark persists. Working great in my frosted glass light fixture.