What cable for an outside light

Going to fit an extra led light outside which will get power from the cable going into an existing one.

Cable will be running about halfway up an outside roughcast wall, not buried anywhere. What sort of cable should I get?

Thanks

You don’t need anything special, but I always enclose outside cables in 20mm PVC ducting, as it’s cheap and just protects the cable from UV and potential damage. I think it also looks neater.

e.g.

Outside Lights by Ben Freeman[/url], on Flickr