A ventilated metal lamp house having an open front with extended finned sides and vertical internal grooves.
The light source comprises a 12 V S.B.C. lamp in holder with 1 m of twin flex.
Complete with metal plate having single and triple slits, one side matt black, the other white.

Ltekonline are the manufacturers of Ray Box Light and Optical Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Physics Lab Experiments for Engineering Teaching Lab in Universities