Among the less standard equipment acquired by De Long was an experimental arc lamp system devised by Thomas Edison, which would supposedly provide light equivalent to 3,000 candles and thus transform the Arctic winter darkness.
Blandt de mindre standardudstyr, der blev erhvervet af De Long, var et eksperimentelt lysbuelampesystem udarbejdet af Thomas Edison, som tilsyneladende ville give lys svarende til 3.000 lys og dermed forvandle det arktiske vintermørke.