Light can be a difficult concept for students who have never had vision to understand. This device allows the student to "hear" the amount of light that reaches a phothosensor by utilizing pitch.
I was first introduced to this device last week when my colleague, Jim Clark, had me come and take a look at it as a student operated it. The device he had was built by his music teacher, Mark Rogers.
As we changed the light setting in the room, the pitch changed. As you raise and lower your hand over the photosensor, the pitch changes accordingly.
You may want to find someone with a bit of electronics background to help in building this device. I could not find it available for sale. From my research it is not complicated to build and requires a minimum of materials all available at Radio Shack. Please see the instructions in the links provided under preparation.
Completely coincidentally, APH is currently in the process of testing a prototype of the SALS (submersible audio light sensor) which works in a similar manner. More details to come on this amazing product when it is available.