Conventional pole transformer

Most lights are single-phase power supply,polemounted transformer which is a street of single-phase power supply will be able to meet the requirements, so the street transformer mostly use single-phase transformer, Farady oil immersed transformer load 50KW of energy with lights.
If you can meet the requirements of the secondary voltage, three-phase transformer can load with lights, but this time we are using a single-phase, three-phase 50KVA transformer so only with lights load 50 / 3KW = 16.67KW of.