Questions about home lighting?

I got this string of Norrsken spotlights, (select box #4 to see it) from Ikea. I need to figure out some stuff before installing it.

It includes a low-voltage designed to power as many as seven small spots (each with a, 12v20w, 38degree reflector halogen bulb) on a pair of wires stretched between two walls.

Instead of running a single pair of wires along the middle of the apartment, which would put the bulbs 9’-12’ from the stuff they’re supposed to light, could I just connect the transformer to two sets of wires, so long as I don’t do over 7 total lights? This would decrease the difference to maybe 6’-9’.

Since I don’t have enough wire to make two runs, I’ll have to buy some more. What gauge wire will work for this? Note: the spots are powered by screw-in pins that pierce the wire’s insulation.

Other question: do I really need to do this. I need to light 3 things, each about a 2’x2’ print. I can put two spots on two of them and a 3rd on another. From 9-12 feet, will that be enough?

There should not be a problem running the lights in parallel on two different strings. Electrically speaking the power source won’t know the difference.

Wire gauge should not be a problem as the total is only 140 watts. 16 or even 18ga lamp cord should be far more than adequate.

Can’t really say if you need to do it but a 20 watt light is pretty puny. Real world performance will depend heavily on the design of the reflector.