I have a PCL at my home base connected to amber landing lights that have helped keep me out of trouble on more than 1 occasion.
If you buy in the UK you are looking at £6000 or so.
I bought over the internet in the UK - cost was less than $1000 including the lights and a few spare bulbs.
Easy to install - 7 clicks to activate to a one second on one second off flash , another 5 clicks and it stays on permanently.
I am sure I need several licences for this and that the CAA would take a very dim view - tut, tut!
Please pm me for the details - I have no financial interest here.
SB
