TCASAlert
See that nobody has replied so far. Can not comment specifically on the Spectrolux but assume that is just a brand of lantern used.
IIRC (Nearly 25 years since I did mine) they were shades of the official colours.
At the time I did not realise they were only green/white/red.
Anyway must have been OK as I passed and am colour safe (well it says so in my licence!)
Best of luck
FD