Eudonia luminatrix is a moth in the Crambidae family. It was described by Meyrick in 1909. It is found in New Zealand. The wingspan is 19–22 mm. The forewings are deep ochreous-brown, streaked with blackish on the veins. The first and second lines are white, edged posteriorly with black suffusion. The hindwings are whitish-fuscous tinged with brassy-yellowish. The discal spot, postmedian line and terminal fascia are fuscous. Adults have been recorded on wing in October and November.