How it works The light is diffused by the frosted jar and give the appearance of sunlight emitting from the (warm coloured LED lights are used to give a more natural and warm light). You may have noticed that there is no switch on the sun jar - in fact there are no visible controls at all - there is a clever light sensor inside that automatically activates the lights when it gets dark or lights are turned out! Mason Jars are not only beautiful but they are completely water tight - so the Sun Jar can happily be left outside in any weather conditions. A perfect garden light or night light for a kids bedroom. Made with a traditional Mason jar and high tech energy efficient lighting! Captured inside the jar are a highly efficient solar cell, rechargeable battery and low energy LED lamp.