I use 11inch by 14 inch photocopy paper as suggested by Mark and value my open frame to support an over the top light from time to time. Enclosed pic of the latest incarnation using my open box.This was during the setting up the previous lights were housed in the aluminium reflectors these present ones are the new leds sold in a pair by Bunnings for builders on a tripod, separated and mounted on the 4 drawer unit that holds cameras etc. Pics take but a few minutes from start to the computer as a rule with heaps of flexibility.
Peter.