It was a spare landing or taxi (?) lamp which was sitting in my toolbox for about 10 years, in its original box, unopened till today.
I don’t think it is even correct for a TB20 because 150W is about 5.5A, whereas the existing lamps draw 4A each. I got it from Jade Air.
It looks clean apart from some corrosion on the terminals.
I will send it free of charge, 1st class post, to the first EuroGA participant in the UK who emails me his/her address 
No warranty on this part, obviously.
