I can definitely recall this style of light in the 1980s at Stafford. Fairly sure Oxford, Banbury, Coventry, Birmingham International and Birmingham New Street had them too, possibly Wolverhampton also. I know the Stafford ones had the station name, not sure about the others. Indeed, from photos of elsewhere on the network, they were still the dominant type at Inter City stations throughout most of the 80s.
Reading had this style of 'single horizontal fluorescent strip light within plastic case on a metal stand' until quite recently, but didn't have the station name and the plastic case was transparent as well.
On the Southern Region they were rarer but recall them at Ashford and Eastleigh in 1986, both on Network Days. The Eastleigh ones had, I think, gone by 1989.
In an Ian Allan book from 1982/83-ish I seem to (90% sure) recall a photo of a 315 at Gidea Park, and remember from this photo that Gidea Park had this style of light, but with the station name in lower case in 'BR 1970s/80s' font. Perhaps all the GE suburban stations had them? Not sure.
The fluorescent strip light style was very common on the Southern Region well into the 1990s, but with a different variation, two separate smaller fittings either side of the pole and no station name. At a few stations (Mortimer was perhaps the latest I saw) they lasted well beyond the millennium. I believe they were still introducing this style into the late 1980s as they replaced 'bulb' lighting at St Denys sometime between 1986 and 1989.