Gaff tape on carpet

[SuperBK]

We also experienced lack of contrast between the official gaffers tape and the carpet we have. Our carpet is a dark blue with some lighter colors mixed in. We wound up testing with regular duct tape that is somewhat shiny. With it, we got a clear difference. Our sensors are mounted aproximately 3.5 inches high, which might be a little much.

Was anyone able to get the orange led to come on that indicates a 2x light return? Looks that that would be ideal, but I don't know if its possible with the gaffer's tape.