NightXP Version 3.1 Poland. Designed to work with the latest version of Xplane; add native light bulbs to brighten xplane lights system avoiding the use of any scripts or tampering with default configuration files. It is very frame rates friendly; work with all versions of xplane. Lights bulbs are only visible at night and disappear in the day. Version 3.1 also add 'emergency lights' along roads to simulate emergency services night action scattered all over the are of coverage. Require Opensceneryx; very easy installation.