He might be referring to what H1HID (username Vick) ALSO calls colorshift (which is why I had argued before that he shouldn't call them the same thing). But I think he wants to know how to bend the shield back 1-2mm closer to the bulb in a projector to increase the blue/purple prismatic strip that is often evident in xenon projector applications. Vick always called that colorshift too. Not to be confused with SCDM colorshift (or whatever Nick calls it) which is where the bulb's actual output color changes over time to higher kelvin due to the electrodes eventually mushrooming over
well i should have clarified it a little more, okay my "horizon" is on the ground it is like a rainbow on the ground where it goes almost red-orange-blue-purple but it looks like the cutoff pattern is on the ground-i thing my projectors are pointed to the ground to much....where the colorshift comes in to play (where it goes from purple-white-purple) if the projectors are aligned perfectly then the "colorshift" (not where the bulbs are burned for so many hours and the kelvin color changes)where when your on the freeway and the car is oncoming to you-the colorshift happens. i dont get that because i assume my projectors are pointed to the ground-my horizon barley shows up on peoples bumpers-barley like just the top purple part of it....by the way its a 2000 accord coupe with a6 euro projectors.
I suggest we use the term "cutoff band" instead of color shift. Cutoff band can be very colorful on some projectors and covers the band slihtly above and slightly below cutoff line.