Certified According to Standards:
ICAO: Annex 14, Volume I – Aerodrome Design and Operations, Paragraph 7.4.4
Romanian CAA (Romanian Civil Aeronautical Authority): No. 12408 from 30.05.2008
An unserviceability light shall consist of a red fixed light.
The light has an intensity sufficient to ensure conspicuity considering the intensity of the adjacent lights and the general level of illumination against which it would normally be viewed.
The intensity is more than 10 cd of red light.