Tex. Transportation Code § 547.334: SINGLE-BEAM LIGHTING EQUIPMENT PERMITTED.

(a) In lieu of the multiple-beam lighting equipment required by Section 547.333, a headlamp system that provides a single distribution of light and meets the requirements of Subsection (b) is permitted for:

(1) a farm tractor; or

(2) a motor vehicle manufactured and sold before September 4, 1948.

(b) The headlamp system specified by Subsection (a) shall:

(1) emit a light sufficient to reveal a person or vehicle at a distance of at least 200 feet; and

(2) be aimed so that no part of the high-intensity portion of the lamp projects a beam:

(A) higher than five inches below the level of the center of the lamp at a distance of 25 feet ahead; or

(B) higher than 42 inches above the ground at a distance of 75 feet ahead.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.