Well the lens are pretty dark...supposedly brighter Xenons are supposed to make up for the lost brightness, but I can imagine the output still isn't like the stock lens.
HID's (high intensity discharge) lights are real bright, but the kits are pricey.
It is possible to separate the lens from the housing in order to clean up any oxidation or buildup inside the lens.
I'm not sure if any of those oxidation removal kits or polishes really work...maybe someone with experience with them will chime in.
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.