The application enables customers of the Lohmann Tierzucht GmbH to adjust light stimulation for a given flock of LOHMANN birds by a tailor made program created on the base of the hatch date and the natural day length, when they meet open house conditions during rearing and/or production. It can be handled easily in a way of modern software tools and provides the infor-mation either by display or printouts. Choosing the hatch date of the flock, the geographical location of the farm and the type of the LOHMANN flock is enough to start the optimisation. An adjusted lighting program will be calculated and can be used to stimulate the birds. For full functionality of the app, you will need a serial number. This number can be requested by sending an email to [email protected].