Thank you for your review. For optimal performance, the lights should be located in an area that receives full, direct sunlight for at least 8 hours per day. IF the lights do not receive the proper amount of sunlight during the day, the runtime will be affected. As with all solar lighting, the light will dim through the night as the batteries drain. If you feel the lights are not operating properly, please call Hampton Bay customer service at 1-855-HD-HAMPTON (1-855-434-2678) and one of the team members will be able to get more information to help troubleshoot and resolve the issue.