### Question
How is the term lumen output defined?


### Answer
The term **lumen output** is defined in *42 U.S.C. § 6291* as the following:

> total luminous flux (power) of a lamp in lumens, as measured in accordance with applicable IES standards as determined by the Secretary

#### 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**

