# The Town and Country Planning (Control of Advertisements) Regulations 1992, Paragraph 3


In relation to advertisements within Class 4A or Class 4B “halo illumination” means illumination from within built-up boxes comprising characters or symbols where the only source of light is directed through the back of the box onto an otherwise unilluminated backing panel.

---
Source: https://www.legislation.gov.uk/uksi/1992/666/schedule/3/paragraph/3 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-control-of-advertisements-regulations-1992/schedule-3/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.