probe-start metal halide ballast
Defined in 1 dictionary — U.S. Code
United States Code
42 U.S.C. § 6291 — for purposes of this part (6 versions over time)
The term “probe-start metal halide ballast” means a ballast that—
(A) starts a probe-start metal halide lamp that contains a third starting electrode (probe) in the arc tube; and
(B) does not generally contain an igniter but instead starts lamps with high ballast open circuit voltage.