How to turn all lights off from one button?

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Recently made a tutorial about all the functions and uses of CollectionService if you wanna check it out

CollectionService in a nutshell

[collectionservice_inanutshell] Hello! This is a post about CollectionService, in a nutshell. What’s CollectionService? Well, CollectionService is a service which allows you to manage groups of instances using tags which are simple strings, but you can’t see them. CollectionService is very useful since it allows us to run functions or change properties from large groups of parts with a single script. Instead of having 10 scripts that do the same, you only have 1. Learning how to use this se…