I'm planning on installing 6 low voltage down-lighters,each lamp is 20w.Supply of lamps will be coming from two 20-60 transformers-each transformer controling 3 lights.Cable i plan on using from transformer to each light (which in length is approx 2 metres max to furthest point) via a junction box is going to be 0.75mm 2 core.Is 0.75 ok