Firefly Look Mason Jar Lights. The charming solar powered LED lights in the glass jars charge during the day and begin glowing up at sundown even indoors if placed in direct sunlight. They are the perfect decor for a rustic feel on the patio, balcony or in the garden: Enjoy magical summer nights in the open in the backyard or at a larger event with the sylvan charm of the solar lit jars. And you don’t even have to bend over backwards to light them because the panel gets charged during the day and the sensor activates the light automatically when it gets dark.