GSSG - Light Flashcards
Light enters the eye and hits ___ on the retina: ___, ___ and ___.
-photoreceptors
-rods, cones and intrinsically photosensitive retinal
ganglion cells (ipRGCs)
___ facilitate peripheral vision and vision in dim lighting conditions, with peak sensitivity to ____.
Rods
green-blue light (498 nm).
___ facilitate daytime vision and color perception, and the peak sensitivity for the sensation of brightness with this system occurs at___.
Cones
green-yellow light (555 nm)
The ___ are critical to the circadian system, sending information to various parts of the brain to trigger
reactions downstream in the body. These cells demonstrate peak sensitivity to ___.
ipRGCs
teal-blue light (≈480 nm).
The ___ the main mammalian 24-hour circadian clock then acts as an oscillator to clocks in peripheral tissues and organs.
Suprachiasmatic nucleuis
___ are the external cues that align physiological functions to the solar cycle. Light is the most important of these cues, keeping the body’s internal clocks synchronized in a process known as ___
Zeitgebers
Circadian photoentrainment
___ radiation at smaller wavelengths and___ at larger wavelengths
ultraviolet radiation
infrared
Light exposure in the late night/early morning will shift our rhythms ____ ___, whereas exposure in the late afternoon/early night will shift our rhythms___.
Forward (phase advance)
Back (phase delay)
Chronic sleep deprivation are associated with increased risk of certain morbidities, including ___, ___,
___, ___, ___ and ___.
- Diabetes, obesity,
- Depression, heart attack, hypertension and stroke.
In general, WELL advocates for lighting that are closer to the daylight light temperature color spectrum ___-____during daytime hours.
5000K-6500K
Light intensity for visual acuity is measured in___, which is a measure of the way the eye responds to light weighted to the response of the ___—the main photoreceptors for daytime vision, located on the retina of the human eye.
- Lux (or foot candles)
- Cone cells
VISUAL ACUITY FOR FOCUS
The following requirements are met at workstations or desks:
- The ambient lighting system is able to maintain an average light intensity of 215 lux or more, measured on the horizontal work plane measured at 30” A.F.F. The lights may be dimmed in the presence of daylight, but they are able to independently achieve these levels.
- The ambient lighting system is zoned in independently controlled banks no larger than 500 ft² or 20% of open floor area of the room (whichever is larger).
- If average ambient light is below 300 lux, task lights providing 300 to 500 lux at the work surface are available upon request.
BRIGHTNESS MANAGEMENT STRATEGIES
Provide a narrative that describes strategies for maintaining luminance balance in spaces, which takes into consideration at least two of the following:
- Maximum brightness contrasts between main rooms and ancillary spaces, such as corridors and stairwells, if present.
- Maximum brightness contrasts between task surfaces and immediately adjacent surfaces, including adjacent visual display terminal screens.
- Brightness contrasts between task surfaces and remote, non-adjacent surfaces in the same room.
- The way brightness is distributed across ceilings in a given room
Ambient light levels of ___ are sufficient for most tasks.
300 lux
Feature 54: Circadian Lighting Design promotes lighting environments for ___. The biological effects of light on humans can be measured in ___, a proposed alternate metric that is weighted to the___ instead of to the cones, which is the case with traditional lux.
- Circadian health
- Equivalent Melanopic Lux (EML)
- ipRGCs
