Versions of Iowa Code 321.420 - Number of lamps lighted on LawServer 2023 Iowa Code 321.420 – Number of lamps lighted 2022 Iowa Code 321.420 – Number of lamps lighted 2020 Iowa Code 321.420 – Number of lamps lighted 2018 Iowa Code 321.420 – Number of lamps lighted 2016 Iowa Code 321.420 – Number of lamps lighted 2014 Iowa Code 321.420 – Number of lamps lighted. 2009 Iowa Code 321.420 – Number of lamps lighted