Poll Everywhere (Chapters 6 & 10)
The SI unit of luminous intensity is the:
candela
One daylighting design guideline suggests that there should be sufficient workplane illuminance from a window up to a distance of ________ times the head height of the window (height of the window above the desk plane).
2.5
In general, with a sidelighting system any interior area more than ________ feet (m) from a window will need to be electrically lit.
30 (9.1)
The recommended daylight factor for difficult prolonged tasks, such as drafting, is:
4.0 - 8.0 %
Which daylighting analysis method(s) work(s) only for a rectilinear space?
CIE method and IESNA lumen method
The standard sky design condition established by the Commission Internationale d-Eclairage (CIE) for daylighting calculation is:
a completely overcast sky
The brightest area of luminance in a cloudy sky is:
at the zenith
Daylight within a space is generally most evenly distributed when:
bilateral lighting from opposite walls is used
The relationship between brightness and luminance can best be described in the following way:
both are terms used to describe light coming off of an object, however brightness is subjective and luminance is measurable
Illuminance is measured more frequently than luminance because:
design recommendations for lighting levels are typically given in terms of illuminance
Illuminance levels and illuminance categories are used to:
establish quantitative lighting system design criteria
The daylighting analysis method that produces a family of daylight factor contours within a room rather than individual daylight factors at specific points is:
graphic daylighting design method (GDDM)
In general, daylight will penetrate further into a space and have a more uniform quality if windows are placed:
high on a wall
Daylight factor (DF) is defined as the ratio of ________.
indoor illuminance to available outdoor illuminance
All of the following strategies can reduce the potential for glare, except:
locate windows to allow direct views outside
The relationship between illuminance and luminance for an opaque surface is best described as:
luminance is illuminance as modified by reflectance
Which is NOT a key goal in daylighting design?
maximize the ratio of glazing to floor area
The reflection that occurs with a smooth surface such as polished glass or a mirror is called:
specular reflection
Illuminance is best defined as:
the density of luminous energy, expressed as lumens per unit area
The externally reflected component (ERC) of the total daylight factor (DF) represents:
the light reflected from exterior obstructions excluding the ground-reflected light
A "bearing angle" of 90 degrees indicates that:
the sun plane is parallel to the vertical surface in question
Photometric readings are usually taken at the height of a "working plane" because:
this approximates the height of typical visual tasks
When a light source produces energy over the entire visible spectrum in approximately equal quantities, the light appears as:
white