Short Answer: I did not read anywhere in the AL vehicle code where it forbids aftermarket forward-facing lamps. I don’t want to say that HID’s are legal in Alabama until I hear back from my AL police officer.
For the long story, here are the references I found in the Alabama State Vehicle Code in regards to Headlights:
Requirements as to headlamps and auxiliary driving lamps.
(a) Visibility distance and mounted height of lamps.
(1) Whenever requirement is hereinafter declared as to the distance from which certain lamps and devices shall render objects visible or within which such lamps or devices shall be visible, said provisions shall apply during the times stated in Section 32-5-240 in respect to a vehicle without load when upon a straight, level, unlighted highway under normal atmospheric conditions unless a different time or condition is expressly stated.
(2) Whenever requirement is hereinafter declared as to the mounted height of lamps or devices it shall mean from the center of such lamp or device to the level ground upon which the vehicle stands when such vehicle is without a load.
(b) Multiple-beam road-lighting equipment. Except as hereinafter provided, the headlamps or the auxiliary driving lamp or the auxiliary passing lamp or combination thereof on motor vehicles other than motorcycles or motor-driven cycles shall be so arranged that the driver may select at will between distributions of light projected to different elevations and such lamps may, in addition, be so arranged that such selection can be made automatically, subject to the following limitations:
(1) There shall be an uppermost distribution of light, or composite beam so aimed and of such intensity as to reveal persons and vehicles at a distance of at least 350 feet ahead for all conditions of loading.
(2) There shall be a lowermost distribution of light, or composite beam so aimed and of sufficient intensity to reveal persons and vehicles at a distance of at least 100 feet ahead, and on a straight level road under any condition of loading none of the high-intensity portions of the beam shall be directed to strike the eyes of an approaching driver.
(3) Every new motor vehicle, other than a motorcycle or motor-driven cycle, registered hereafter in this state, which has multiple-beam road lighting equipment shall be equipped with a beam indicator, which shall be lighted whenever the uppermost distribution of light from the headlamps is in use, and shall not otherwise be lighted. Said indicator shall be so designed and located that when lighted it will be readily visible without glare to the driver of the vehicle so equipped.
(c) Use of multiple-beam road-lighting equipment. Whenever a motor vehicle is being operated on a roadway or shoulder adjacent thereto during the times specified in subsection (a) of Section 32-5-240 the driver shall use a distribution of light, or composite beam, directed high enough and of sufficient intensity to reveal persons and vehicles at a safe distance in advance of the vehicle, subject to the following requirements and limitations:
(1) Whenever a driver of a vehicle approaches an oncoming vehicle within 500 feet, such driver shall use a distribution of light, or composite beam, so aimed that the glaring rays are not projected into the eyes of the oncoming driver. The lowermost distribution of light or composite beam, specified in subdivision (2) of subsection (b) of this section shall be deemed to avoid glare at all times, regardless of road contour and loading.
(2) Whenever the driver of a vehicle follows another vehicle within 200 feet to the rear, except when engaged in the act of overtaking and passing, such driver shall use a distribution of light permissible under this division other than the uppermost distribution of light specified in subdivision (1) of subsection (b) of this section.
(d) Single-beam road-lighting equipment. Headlamps arranged to provide a single distribution of light not supplemented by auxiliary driving lamps shall be permitted on motor vehicles manufactured and sold one year hereafter in lieu of multiple-beam road-lighting equipment herein specified if the single distribution of light complies with the following requirements and limitations:
(1) The headlamps shall be so aimed that when the vehicle is not loaded any of the high-intensity portions of the light shall, at a distance of 25 feet ahead, project higher than a level of five inches below the level of the center of the lamp from which it comes, and in no case higher than 42 inches above the level on which the vehicle stands at a distance of 75 feet ahead.
(2) The intensity shall be sufficient to reveal persons and vehicles at a distance of at least 200 feet.
Required lighting equipment and illuminating devices of vehicles.
(a) When lighted headlamps required.
(1) Every vehicle upon a highway within this state, except a parked vehicle, which shall be subject to Section 32-5-244, shall display lighted lamps and illuminating devices required by this section for different classes of vehicles at the following times:
a. From a half-hour after sunset to a half-hour before sunrise.
b. At any time when the windshield wipers of the vehicle are in use because of rain, sleet, or snow, except when the use is intermittent because of misting rain, sleet, or snow.
c. At any time when there is not sufficient light to render clearly discernible persons and vehicles on the highway at a distance of 500 feet.
(2) Notwithstanding subdivision (1), whenever motor vehicles or other vehicles are operated in combination during a time that lamps and illuminating devices are required to be lighted, any lamp, other than a tail lamp, that, by reason of its location on a vehicle in the combination would be obscured by another vehicle of the combination, need not be lighted. This subdivision shall not affect the requirement that lighted clearance lamps be displayed on the front of the foremost vehicle required to have clearance lamps or that all lamps required on the rear of the rearmost vehicle of any combination shall be lighted.
(b) Headlamps on motor vehicles.
(1) Every motor vehicle, other than a motorcycle or motor-driven cycle, shall be equipped with at least two but not more than four headlamps, with at least one but not more than two on each side of the front of the motor vehicle. The headlamps shall comply with the requirements and limitations of Section 32-5-242.
(2) Every motorcycle and every motor-driven cycle shall be equipped with at least one and not more than two headlamps which shall comply with the requirements and limitations of Section 32-5-242.
(3) Every headlamp upon every new motor vehicle sold after January 1, 1950, including every motorcycle and motor-driven cycle, shall be located at a height measured from the center of the headlamp of not more than 54 inches nor less than 24 inches to be measured as set forth in Section 32-5-242.