Thank you for your review. When fully charged, the lights will produce a decorative 4.2 lumen light output. 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 are not located in an area that receives enough sunlight each day, the runtime can be decreased. If you require bright light that lasts the entire night, we would suggest low-voltage lighting. 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.