Lastolite LL LU3212F Lumen 8 PVC Umbrella 76cm Description. The Lastolite Lumen 8 76cm White PVC Umbrella 8mm fitting is designed to complement the Lumen 8 Studio Flash system. The Lastolite 3212F Umbrella has a light loss is 0. 9f stop & colour temperature is 5450 degrees.