(Portland, OR) -- Portland Parks and Rec is entering the final phase of a project to replace 100 year old light poles that were in danger of falling over. The poles have been replaced in 11 parks with the final three parks starting this week. They are Mt. Tabor, Lair Hill and Ladds Circle parks. The new lights are 66 percent more efficient than the old lights and they're also designed to be Dark Sky-friendly. They don't send light upward, which also helps nearby homes.