Addendum 2 for ANSI/IES RP-16-17, Nomenclature and Definitions for Illuminating Engineering

If you, as a user of ANSI/IES RP-1-12, believe you have located an error not covered by the following revisions, you should 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 2 was approved by the IES Standards Committee on July 30, 2018, and by the American National Standards Institute (ANSI) on November 6, 2018.

Removed from RP-16-17:

latitude
longitude
profile angle
sun bearing
solar radiation simulator
direct solar simulator
sky factor

Changes to Existing Terms and Definitions:

air mass (optical air mass)
azimuth
bilateral sidelighting
clerestory
daylight
daylight factor (DF)
diffuse sky radiation
fenestration
global solar radiation
ground light
shading coefficient
sky luminance distribution function
skylight
solar efficacy
toplighting

Section Name or Number Changed:

altitude
astronomical time clock
regular (specular) reflectance
regular (specular) reflection
regular transmittance
regular transmission
solar constant
solar illuminance constant
sunlight

New Terms and Definitions:

annual operating hours
annual sunlight exposure (ASE)
artificial sky
artificial sky “mirror box”
bi-level lighting control
blinds
chromogenic glazing
CIE sky models
closed-loop control
continuous daylight autonomy (cDA)
critical task location
daylight autonomy (DA)
daylight coefficient
daylight harvesting
daylight louver
daylight management
daylight window
daylight zone
daylighting
daylighting system
daylit
diffusely reflective
direct solar radiation
direct sunlight
direct sunlight hours
dual-loop photosensor control
dynamic glazing
electrochromic glazing
equation of time
externally reflected component (ERC)
extraterrestrial solar radiation
façade orientation
field of view (FOV)
global illuminance
haze factor
horizontal shadow angle
incident angle
insulated glazing units
internally reflected component (IRC)
laminated glass
light shelf
light well
light-to-solar-gain ratio
lighting power density (LPD)
local solar time (LST)
low-e coating
low-iron glass
Julian day
miniblinds
multilevel lighting control
open-loop control
Perez Sky Model
photochromic glazing
photosensor
photosensor control algorithm
primary daylight zone
reflective film
rooftop monitor
sawtooth roof
secondary daylight zone
sidelighting
sky component (SC)
sky illuminance
sky luminance distribution models
solar altitude
solar azimuth
solar declination angle
solar film
solar heat gain coefficient (SHGC)
spatial daylight autonomy (sDA)
spectrally selective glazing
specular angle (direction) for transmission
specularly reflective
thermochromic glazing
total solar radiation
translucent
translucent insulating panels
tubular daylighting device (TDD)
U-factor
useful daylight illuminance (UDI)
venetian blinds
vertical blinds
vertical shadow angle
view window
visible transmittance (VT, VLT, or Tvis)
window
window sash
window shades
zenith

New Terms for Index Only:

daylighted
profile angle
solar constant
solar illuminance constant
solar time