Because 500 + 500 + 150 Watts is about 5 Amps. As this is about the limit of a 5 Amp cable, without taking into account the diversity of heat and cold, on an outside wall, I was unsure as what to use. I went for over kill.
You could never read his mind :-)
It now looks like a cable that is inside a conduit, or comes out from the wall adjacent to the lights is the permanant way to do this and this is my way for him to pursue.
It now looks like you are right. I went to a company today, that recomended a cable that was armoured and it was almost a big as a finger in diam.
Going back to the stupid question point. I have always found this ng to be the finest that I subscribe to. I salute you all for your brains and advice. I have learned a hell of a lot from you all. I am far from stupid, but other posters have put me right on things that I did not have a 100% grasp on.
I'l try and talk him into this.
Thanks
Dave