The baskets are different sizes, and so have a different number of lights. The one shown on the left is the smaller of the two, which has 2 strings of 80 lights on it. The larger chandelier uses 3 strings.
In the photo you can see the base has been completed but not the top. To get even spacing and lengths an equal distance was allowed between each pass below the basket (in this case 10 leds, which is equivalent to 1m). These hanging sections were then pulled taught to the top of the hanging chains. It was important to make sure that each line was pulled to the same tension to avoid a tilted chandelier; this meant that each section was tied to the hanging chain at a slightly different height with a cable tie for maximum flexibility. The ends were then wrapped up around the hanging chain and taped together to keep them neat all the way back to the controller.
These also gave us the opportunity to use some y-connectors we had made so that despite using multiple strings to cover it the whole chandelier is only one output from our DMX boards. These make things much neater and give us the ability to wire things in quickly.