Well I wasn't thinking blackout as in darkening the lenses themselves. I meant the headlights with the black housings. I was hoping it wouldn't decrease output too much...

Like these:

Amazon.com: Pontiac Grand Prix Replacement Headlights w/ Amber Corner Signal Lights Driver/Passenger Combo Black: Automotive

Not like these:

Amazon.com: Pontiac Grand Prix Black Smoked Headlights Headlamps Driver Left + Passenger Right Replacement Pair: Automotive