This page lists the raw data about LED message signage, broken down into the individual sources from which the data has been assimilated. You will probably find it useful to "search in page" (usually CTRL+F).
Data from European Photonics Industry Consortium (EPIC):
→ rdf:type → photonics:Capability
→ rdfs:label → “LED message signage”
→ photonics:capability → http://www.ukphotonics.org/id/capability/led-message-signage