Talamex LED Mast Head Light From  £15.60

Great replacement for the one I ripped off the mast with the main halyard. The screw holes spacing are standard and were a direct match for the lost light, so no drilling. My original light was slightly thinner thickness on the base plate, so I needed 4mm x 20mm bolts longer than the originals. Make sure you fit with the little drainage hole at the bottom. Lovely and bright, just two wires (-/+) to connect, I used crimps wrapped with amalgamating tape to connect, all good fun dangling from a bosuns chair half way up the mast. LED so no power drain, going to buy other navigation lights in this style/brand.

Beware when fitting. You may find the tiny drain hole is at the top!