Addendum 4 for ANSI/IES RP-16-17, Nomenclature and Definitions for Illuminating Engineering

If you, as a user of ANSI/IES RP-16-17, believe you have located an error not covered by the following revisions, please e-mail your information to Pat McGillicuddy, pmcgillicuddy@ies.org, or send a letter to Pat McGillicuddy, Manager of Standards Development, IES, 120 Wall St., 17th Floor, New York, NY 10005.
Additions will be posted as they become available.

Addendum 4 was approved by the IES Standards Committee on February 13, 2020, and by the American National Standards Institute (ANSI) on April 24, 2020.

Click here to download Addendum 4 for RP-16-17, Nomenclature and Definitions for Illuminating Engineering. [PDF 1.3MB]

Removed from RP-16:

color of a physical stimulus
flick interval
flick-scint
luminous density
multiflick flash
tungsten-halogen

Changes to Existing Terms and Definitions:

analog multiplex, (AMX)
angle of collimation
astronomical timeclock
circadian
colorimetric purity of a light, pc
cones
contrast rendition factor, CRF
channel
digital multiplex, DMX
dimmer
distal stimuli
equivalent contrast, C
equivalent contrast, Ce
equivalent sphere illuminance, ESI
exposure limit (EL)
fovea
ganglion cells
germicidal radiation
glossometer
index of sensation, M
light
long-arc lamp
luminaire (light fixture)
luminaire spacing criterion (SC)
luminance difference threshold
luminous efficacy of a source of light
luminous flux Φ
mesopic vision
PAR lamp
photocuring
photopic vision
photosynthesis
photosynthetic photon flux density (PPFD)
photosynthetically active radiation (PAR)
physical stimuli
point brilliance, E
point of observation
point vision
pressed reflector lamp
primary
proximal stimuli
reflectance, ρ (of a surface or medium)
retina
rods
scotopic vision
standard source A
sealed-beam headlamp
sealed-beam lamp
stop lamp
time clock
total internal reflectance (TIR)
transmittance, τ (of a medium)
tungsten-halogen lamp
very short flashes

New Terms for Index Only:

astronomical timeclock control
timeclock