Hi all does anyone know if any torch in strobe position will spell out SOS
No, it will not, you need a light with a SOS selection. This is usual stated in the specifications.
The common flashing modes are:
Tactical strobe or fast strobe: A fast flashing, typical above 10 hz and at full brightness
Slower strobe: a strobe with 2-5 hz is good as a attention getter, this can be at full or reduced brightness.
Beacon: 1 hz or slower, can be used to mark a position.
sos: The sos morse code.
The names and actual implementations of the different flashing modes vary with manufacturer.