1. Regulations.Gov: 2022-05-09 Energy Conservation Program: Definitions for General Service Lamps; Final Rule. https://www.regulations.gov/document/EERE-2021-BT-STD-0012-0022; accessed 15 September 2022.
2. Govinfo.gov: Sec 571.108 Standard No. 108 https://www.govinfo.gov/content/pkg/CFR-2004-title49-vol5/xml/CFR-2004-title49-vol5-sec571-108.xml; accessed 15 September 2022.
3. Congress.gov: HR 3684 Section 24212 (Headlamps), The Infrastructure and Jobs Act, with the amending of Standard 108, https://www.congress.gov/bill/117th-congress/house-bill/3684/text; accessed 15 September 2022.
4. P. Moon, The Scientific Basis of Illuminating Engineering (Dover Publications, New York, 1961), pp. 150, 162;