Each 1.5m long track is equipped with three spotlights, each with 30 watts, which is 90W.

How many long rails can a set of 2.5 square lines connect? What is the material of 2.5 square meters of wire? If it is copper, it can carry 3500-5500 watts, and the safe power is 3500/90=38.88. So there's no problem with line 38.

A 2.5-square conductor can withstand a current of about 20 amperes, which means that it can carry a load of about 4400 watts at a voltage of 220 volts. Divided by 30,4400 is about 146 lamps, each with three lamps, which can connect about 48 long rails.