Historic luas data fetched by the luas-archiving-service at https://luas-archiving-service.azurewebsites.net/
-data
--historic
---2016-03-13-HH
files: luas-TIMESTAMP.json
That is, a directory is created for every hour of the day and readings taken every minute are each saved to a file, named with a timestamp. The data in each file is flat.