A dusk-to-dawn sensor sounds like a bright idea.
Three Philips Dusk-to-Dawn A19 frosted soft white light bulbs are down to $15.10 total on Amazon. This 3-pack normally sells for around $24 and often goes as high as $27. The drop to $15 is the lowest we have ever seen.
These energy efficient bulbs use less energy than their 60W incandescent equivalent and are Energy Star certified. They will also last 10 times longer with up to 22,000 hours of life. They deliver 2700 Kelvin light, and the Dusk-to-Dawn tech includes a built-in sensor to turn on and off automatically with the sun. The bulbs are covered by a 10-year warranty. Users give them 4.5 stars based on 582 reviews.