### Question
How does ENERGY CONSERVATION define ER40?


### Answer
Under *42 U.S.C. § 6291*, **ER40** is defined as:

> an ER incandescent reflector lamp with a diameter of 40/8ths of an inch

#### 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**

