Light Flashcards
The wavelengths of visible light range from roughly 400 nm to ___ nm.
700
The ___ of the eye mostly facilitate circadian rhythm synchronization and demonstrate peak sensitivity to teal-blue light (about 480 nm).
ipRGCs
___ lighting is lighting that is used to illuminate an area in order to allow the performance of a specific function.
Task
___, is a precondition for the New and Existing Interiors and New and Existing Buildings project types that establish light levels for basic visual performance.
Feature 53: Visual Lighting Design
The circadian rhythm is the internal clock that keeps the body’s hormones and bodily processes on a roughly ___ cycle, even in continuous darkness.
24 hour
___ is the excessive brightness, excessive brightness contrast, and excessive quantity of light of a light source.
Glare
___ glazing is glazing that is below 2.1 m (7’) and designed to allow building occupants clear views of the outside.
Vision
The color rendering index average (CRI Ra) is a value on a scale of 1 to ___ based on reference colors R1 through R8.
100
Part 2: Responsive Light Control of Feature 60 requires that lighting automatically dim to ___% or less, or shut off, when a zone is unoccupied.
20
The goal of ___ is to optimize a project’s windows in order to increase the amount of daylight available for the building spaces while limiting the amount of glare and heat gain.
Feature 63: Daylighting Fenestration
A complete lighting unit that includes the components that distribute light, position and protect the lamps, and provide connection to the power supply.
Luminaire
Glazing that is specifically designed and located to allow for deeper penetration of daylight into the interior spaces of a building.
Daylight glazing
The amount of light in the visible portion of the spectrum (roughly 400 nm to 700 nm) that passes through a glazing material. VT is measured as a percentage or number from 0 to 1.
Visible transmittance (VT)
The range of all types of electromagnetic radiation.
Electromagnetic spectrum
Radiant power weighted to human vision that describes light emitted by a source in a particular direction.
Luminous intensity
The total luminous output of a light source, measured in lumens and weighted to the visual sensitivity of the human eye.
Luminous flux
Energy in the form of electromagnetic waves, including gamma rays, X-rays, ultraviolet (UV) light, visible light, infrared (IR) light, microwave radiation, and radio waves.
Electromagnetic radiation
The distance between two points on a wave in which the wave repeats itself.
Wavelength
The amount of light incident on a given surface measured in lux or footcandles.
Illuminance
The spectral distribution of electromagnetic radiation of a blackbody at a given temperature, measured in degrees Kelvin (K).
Correlated color temperature (CCT)
An output component that converts electrical energy into light.
Lamp
Lighting that is used to highlight architectural or design features of a space or to add visual interest to a space. Also known as decorative lighting.
Accent lighting
A lamp that produces light from an arc tube.
High-intensity discharge (HID) lamp
A rating of how much usable light is reflected or absorbed by a given surface, with values ranging from 0 (0%) to 1 (100%).
Light reflectance value (LRV)
A percentage of space in which the light level from direct sun alone exceeds a predefined threshold for some quantity of hours in a year.
Annual sunlight exposure (ASE)
A lamp with semiconductor devices that produce visible light when an electrical current passes through them.
Light-emitting diode (LED) lamp
The clarity or sharpness of vision.
Visual acuity
A measure of light that is used to quantify how much a light source will stimulate the light response of melanopsin.
Equivalent melanopic lux (EML)
A percentage of floor space in which a minimum light level can be met completely for some proportion of regular operating hours by natural light.
Spatial daylight autonomy (sDA)
A lamp that produces light by the flow of current through a tungsten filament inside a sealed glass bulb sometimes filled with a gas.
Incandescent lamp
The main source of nonspecific illumination in a space. Also known as general lighting.
Ambient lighting
A measurement of how bright a surface or light source will appear to the eye, measured in candela per square meter (cd/m2) or footlamberts.
Luminance
An index that features a comparison of the appearance of 8 to 14 colors under a light source in comparison to a blackbody source of the same color temperature
Color rendering index (CRI)
A low-pressure discharge lamp in which ionization of mercury vapor transforms UV light generated by the discharge into visible light.
Fluorescent lamp
The internal clock that keeps the body’s hormones and bodily processes on a roughly 24-hour cycle, even in continuous darkness
Circadian rhythm
The process of using a computer program to simulate the effects of natural light on the interior of a new or existing building.
Daylight modeling
Glazing that has the ability to control the amount of light passing through it. Also known as smart glass.
Variable opacity glazing
