Light is a necessary factor for the life and development of almost all organisms. It significantly impacts on the proper growth and behaviour of birds. In particular, it is important to have proper and evenly distributed light intensity for young animals, contributing to the proper development of internal organs, which translates into better use of fodder. At the same time, increasing electricity prices mean that Polish manufacturers are looking for energy-efficient solutions to light the buildings more and more often. Wesstron also has its own production of livestock doors that are resistant to aggressive environmental factors.