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Lumen app uses the light sensor built into your phone along with other parameters and provides suggestions and actions to turn off the lights in the room depending on the lighting conditions and surrounding environment and factors. A minimum luminosity factor is maintained for each room depending on the activity performed. The time of day, location and activity is logged and pushed to the could where an algorithm analyses and makes future predictions depending on patterns. Not only limited by light, other power intensive devices such as heaters, air conditioning and other power intensive applications.