... confirm good connection between tube and ballast firstly,and then make the L side and N side of ... tube, tube and the side of reflector need 70~90mm distance, at least 40mm from bottom of ... to keep before 50 centidegree. The farther between ballast and heat source, the better. 6. Solar ... in workshop, hall, square, highway, big marketplace and so on project lighting, especially for factory, school ...