_
[1]
I've used a multi meter to suss out the pins on the twin lamps
So,
with the lamps upturned, facing upwards and pins going from bottom to top
it shows that,
Pin 1 is live brown
Pin 2 is Blue Neutral
Pin 3 is Hot wire Black
Pin 4 is Earth
_
[2]
[very important]
The Ballast manual says...