Authorities in Vietnam's capital of Hanoi are turning off street lights to keep the national power system running amid record temperatures bringing a surge in demand in some parts of the Southeast Asian nation. As weather officials warn the heat wave could run into June, several cities have cut back on public lighting after state utility EVN said rising demand for air conditioning could burden the national grid further. "It's so harsh and hot outside that people have to wear protective clothing to cool down and not get burned," said Hanoi resident Tran Van Hung, 67.