Thanks Ian, not got an I phone, but found an app that has nav light rules on it..........
Just had notification that my mast lamps have been completed and are on their way over to me, so should be here mid week.
I have done 2 sizes, both take a standard 3mm LED. One is 5mm dia the other is 6mm dia. The idea is to fit coloured LED in, paint the top and bottom black (mask off area if needs to be less than 360 deg view). One leg (neg) to be soldered directly to the mast, the other will be cut very short with a length of KYNAR wire soldered to that and sealed off, threaded through very small hole in the mast and down to a master resistor board (yet to be made). Hope to get some pics as it progresses.
If it fails, I shall just use the standard 3mm LED's with no cover.....I am hoping it looks life like, if not it only cost a tad over a tenner for them.
Fingers crossed.