### Question
What does probe-start metal halide ballast mean?


### Answer
**Probe-start metal halide ballast** has the following meaning in *42 U.S.C. § 6291*:

> a ballast that—


(A) starts a probe-start metal halide lamp that contains a third starting electrode (probe) in the arc tube

#### Citation:
  - *42 U.S.C. § 6291*
  - Heading: **CHAPTER 77-ENERGY CONSERVATION > SUBCHAPTER III-IMPROVING ENERGY EFFICIENCY > Part A-Energy Conservation Program for Consumer Products Other Than Automobiles**

