Another post spoke of light tubes, those light gathering tubes that run from roof to home interior. That started me to thinking about making some rather than spending $150 or so for each of them. Does anyone know what 10 inch schedule 40 PVC pipe might sell for? I can't seem to use the right search on the NET to find a price and don't want to wait until Monday to toy further with the idea. My thoughts are to size a portion for length, spray the interior of it with spray adhesive or other, then use reflective mylar rolled onto a dowel to apply it to the inside of the tube. It shouldn't take much thought to figure out a diffuser for the interior, but might take a bit more thought for a light gathering dome on the rooftop. Thoughts?