" I used the Daewoo casing, and the Infiniti lenses and reflectors. "

Cool, I like home made stuff from the salvage yard.

If the focus ( distance from the burner / bulb to lens ) has changed, the light output might be affected.

Also, are the bulbs used? Does the glass look silver or dark? Bulbs wear out before they burn out. Filament bulbs throw off tungsten the silvers the inside of the glass, arc discharge bulbs probably do the same with mercury.

K is the color temperature not light output.