For the purposes of this section, a lamp or lighting device meets the requirements specified below so long as any portion of the illuminating surface of the lamp or lighting device is within the specified range.

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All lamps and lighting devices covered in this section may be installed so that the entire lamp or lighting device exceeds forty-two inches above the level surface upon which the vehicle stands so long as such lamps or lighting devices are either covered or dimmable.

(a) Spot lamps. — Any motor vehicle except a public utility company maintenance vehicle may be equipped with not more than one spot lamp and every lighted spot lamp shall be so aimed and used upon approaching another vehicle that no part of the high-intensity portion of the beam will be directed to the left of the prolongation of the extreme left side of the vehicle nor more than one hundred feet ahead of the vehicle. A public utility company maintenance vehicle may be equipped with more than one spot lamp but all lighted spot lamps shall be aimed and used in conformity to the requirements of this subsection.

(b) Fog lamps. — Any motor vehicle may be equipped with not more than two fog lamps mounted on the front at a height not less than twelve inches nor more than thirty inches above the level surface upon which the vehicle stands and so aimed that when the vehicle is not loaded none of the high-intensity portion of the light to the left of the center of the vehicle shall at a distance of twenty-five feet ahead project higher than a level of four inches below the level of the center of the lamp from which it comes.

(c) Auxiliary passing lamp. — Any motor vehicle may be equipped with not more than two auxiliary passing lamps mounted on the front at a height not less than twenty-four inches nor more than forty-two inches above the level surface upon which the vehicle stands and every auxiliary passing lamp shall meet the requirements and limitations set forth in this article.

(d) Auxiliary driving lamp. — Any motor vehicle may be equipped with not more than two auxiliary driving lamps mounted on the front at a height not less than sixteen inches nor more than forty-two inches above the level surface upon which the vehicle stands and every such auxiliary driving lamp shall meet the requirements and limitations set forth in this article.

(e) Roof-mounted off-road light bar lighting device. — Any motor vehicle may be equipped with a roof-mounted off-road light bar lighting device comprised of multiple lamps: Provided, That whenever the vehicle is operated or driven upon any road or highway of this state, the roof-mounted off-road light bar lighting device shall be turned off while the vehicle is being operated on any road or highway of this state.