This is a fantastic product.  Initially we placed one light in an area that receives all day direct sun and the other closer to where we had intended to hang both lights.  Both absorbed sun and lit well.  There was a slight difference in brightness, but not enough to rule out the shadier location for a mounting place.  Lights came on at dusk and lasted ALL night.  Wonderful even with the reduced sunlight through clouds which we have many days in early Wisconsin spring.