Unknown Emg 8W Fitting

Picked this up for a quid in a charity shop.
It puts the word bulk in bulkhead!
Unused, no holes drilled for wires.
Drop it in a pool and it wouldn't know what happened to it.
Has battery backup that despite being unused hasn't seemed to have aged well.

I'm sure you've all noticed how lonely that T5/8W/640 looks in there next to those bare tube socket holes.
I think something needs to be done about that!

I was thinking as you can pick up 12V 8W fittings pretty easily of making this a 3x8W battery powered fitting.
Doing this would be fully reversible and mean I wouldn't have to drill anything and keep it in near NOS condition.
What would you all do with it?
If I remember correctly someone else on here had one like it.