High efficiency lines are optimized for the best conversion of sunlight into electricity. This includes ultrahigh and multi-junction solar cells like monocrystalline silicon with Passivated Emitter Rear Contact (PERC), heterojunction, as well the new multi-junction cells. As energy losses from reflection, thermal effects, and recombination are minimized, these cells can achieve efficiencies of greater than 25%, outstandingly high compared to standard panels which typically sit lower. High efficiency panels are costlier initially, but their energy yield over years and reduced space needed make them suitable even for regions with space constraints like urban rooftops or commercial buildings.