I just tried this on my 55HX70 and am unsure if I'm doing this correctly. Using standard width electric tape, I placed a strip (covered the sticky side to protect the lens) over the the inside edge of the red and blue lenses. Is there an indicator, say using Avia, as to how far in to place the tape? A standard for a 55" TV? How does this work? I was expecting to see the red and blue completely cut off by the tape on either end of the screen, but it only lowers the output, like it is supposed to. Interesting to me.