### Question
How does the law define average lamp efficacy?


### Answer
Under *42 U.S.C. § 6291*, **average lamp efficacy** is defined as:

> the lamp efficacy readings taken over a statistically significant period of manufacture with the readings averaged over that period

#### 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**

