Lighting Decorative Lighting Light emitting diodes (LED) lights use up to 90% less electricity and last 10 times longer than old incandescent lights. Use ENERGY STAR qualified seasonal light-emitting diodes (SLEDS) light strings. Solar-powered seasonal (SLEDS) use improved solar technology and require only a little sunlight to recharge, even recharging on cloudy days. More Replacing your old holiday incandescent lights with LED lights can bring holiday cheer to your electricity bill. They use up to 90 % less electricity. Look for ENERGY STAR qualified light strings. Last 10 times longer. Are far more durable with no glass bulbs to break or replace. Cool to the touch because they produce almost no heat – they give you peace of mind when using indoors.