These are the ONLY HID's out there that are designed for reflectors, but it's not that gray strip, it's mainly because the bulb itself/lighting capsule is actually much shorter and in the same position as a halogen filament. The problem is, with ANY bulb brighter than the garbage halogen, even IF designed with the halogen filament in mind, is that the reflectors can also only handle so much extra brightness before causing excessive glare regardless of the design.. for example, if there was such a thing as a super bright halogen that was optional and didn't melt the wiring etc, you'd still have glare depending on how much brighter than a regular halogen is. Now, in lots of testing we've found the TechMax to be a very decent LED but even then it has a little excess glare, I was flashed once on a very foggy day when the fog created more scatter. So I eventually went with Euro projectors, there are very good quality Depo replicas for about $350 shipped for the pair and even with a "halogen projector", as long as you use LED's or this one HID set actually designed for halogen placement then they work great. For those staying with the reflectors I'd use the chart
HERE. They test on a VW reflector but you can tell which ones are eityher perfect or near perfect cutoff with the least amount of light/darkest areas above the cutoff that means no glare. So yes, you CAN upgrade your reflector bulbs but HAVE to be super careful about what you pick. LED's have comea LONG ways in the last few years but still require a lot of research to make sure you get the right ones. I tried "regular" HID's in my new Euro's and they had tons of glare. Swapped to Katana LED's which are very highly rated for halogen projectors and am near perfect with great output.