actually, aftermarket dont have the flicker(changing from white to blue/purple oem hids do, aftermarket ones normally stay that very purple or ricey lookin blue with whitish tones. you probably saw an OEM HID retrofit on the car, basically, take hid projectors and the bulbs and ballast that come equipped on cars with hids, like s2000, audis, bmws, mercedes benz, acuras, lexus' and puttin them into cars like a 7th gen accord. different brand aftermarket hids DO NOT LOOK like oem hids, no offense, im not sure what standards you have who wrote that, but if u take a car with a rebased kit(even the most expensive aftermarket kits are cheaper then good oem projector retrofit projects such as s2000s/lexus sc430, newer acura tl, acura tsx, REAL d2s clear ece valeos which are euro spec audi S4, mistubishi EVO VIII projectors) and put it next to a car like say a cadlillas CTS that has hids stock, and have them drive toward you, that rebased kit wont flicker AT ALL and be as bright as the OEM hid equipped car, with less sharp cutoff, the rebased kiit will most likely have hotspots and MASSIVE glare. wont have that intense pure white to deep blue or purple we all love in hids.