Available for purchase directly from the Illuminating Engineering Society website in digital PDF or print formats. IES members generally receive significant discounts.
): The amount of light falling onto the road surface, measured in lux ( ) or footcandles (
What or zone type are you designing for? Are you integrating smart controls or dimming schedules ?
is an American National Standard developed by the Illuminating Engineering Society (IES). The designation "RP" stands for Recommended Practice , "8" identifies the specific committee track for roadway lighting, and "18" denotes its publication year (2018). ansi ies rp-8-18 pdf
Accounting for how the human eye perceives light in low-light outdoor conditions, where blue-green wavelengths (prominent in cool LEDs) improve peripheral visibility compared to warm yellow HPS lights.
The standard is designed to ensure that lighting systems are not just compliant, but also:
Hyperlinks, bookmarks, and searchability. Are you integrating smart controls or dimming schedules
The ANSI IES RP-8-18 PDF has a wide range of applications in various fields, including:
Minimizing disability and discomfort glare caused by poorly aimed or excessively bright light sources.
ANSI/IES RP-8-18 was a landmark publication in the history of lighting design, representing a massive consolidation effort. While this specific edition has been superseded, the technical approach and criteria it established remain relevant and form the DNA of all current and future roadway lighting standards. Accounting for how the human eye perceives light
Once you obtain the official PDF, here is what you will find (typically 70–90 pages):
By strictly adhering to this workflow and the numerical benchmarks within the standard, jurisdictions can shield themselves from liability, optimize capital expenditures, and build nightly environments that protect drivers and pedestrians alike.