hoka and his team are exploring the effects of sky glow on water. they've positioned l.e.d. lights in circles in a number of test basins they simulate various degrees of light pollution. and. this is explained it's extremely hard to develop a test model which allows you to observe the effects of sky glow on an ecosystem what we have here is a very very diffuse light but it still affects vast swathes of landscape at night. areas across germany europe all over the world are affected by sky glow in. the sky go into the top. 24 test basins make up a floating a bar a tree. the researchers will be trying to identify the extent that sky glow affects the underwater world the life processes of marine organisms are determined by the intensity of light the researchers take water samples from the test cylinders illuminated to varying degrees samples are taken from various depths and at different times of night and day every type of marine organism from bacteria to algae to fish is of interest the fish confort this is the light allows the fish to see better as they feed and so all plankt