Much research is still needed to find out if light traps have any practical values in corn borer control. They're not recommended for use in Iowa in 1950.
Lilly, J. H.; Beaty, Harold; and Johnson, Erwin
"Light Traps? - Not Yet!,"
Iowa Farm Science: Vol. 4
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol4/iss11/2