IDFX LIGHTING UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE RESOURCE
●● visible light
Answer: a form of electromagnetic radiation with wavelengths that
range from 400(red)-700nm)violet) White light produced when source
emits equal quantities of energy
●● Candlepower (cp)
Answer: Unit of luminous intensity approximately equal to the
horizontal light output from an ordinary wax candle
●● lumen (lm)
Answer: =brightness
the unit of luminous flux equal to the flux in a unit solid angle of one
steradian from a uniform point source of one candlepower
●● illumenance
Answer: the density of luminous flux incident on a surface in lumens per
area
●● lunimance
,Answer: also aka brightness
luminous flux per unit of projected area and unit solid leaving a surface,
either reflected or transmitted. Takes into account the reflectance and
transmittance properties of materials and direction they are viewed.
●● luminous intensity
Answer: the solid angular flux density in a given direction measured in
candlepower or candelas
●● direct glare
Answer: results when a light source in the field of vision causes
discomfort and interference with the visual task
●● visual comfort probability (VCP)
Answer: A metric used in evaluating the problem of direct glare. The
VCP is the percentage of normal observers who may be expected to
experience visual comfort in a particular environment with a particular
lighting situation.
●● critical glare zone for direct glare
Answer: area 45 degrees right above light source
●● reflected glare
, Answer: occurs when a light source is reflected from a viewed surface
into the eye, aka veiling reflection
●● angle of incidence is equal to the
Answer: angle of reflection
●● contrast
Answer: the difference in illumination level between one point and
nearby points
●● brightness ratios should be limited to
Answer: 3:1 between task and immediate surroundings(paper and the
desk top)
5:1 task and general surroundings
10:1 task and remote surroundings
●● unifoirmity
Answer: of lighting affects comfort of space, uniform lighting is not
desirable unless you are drafting or machine work. Some shade and
shadow provides highlights and interest
●● color in lighting
Answer: an interaction between the color of the light source and the
color of the objects that reflect the light
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE RESOURCE
●● visible light
Answer: a form of electromagnetic radiation with wavelengths that
range from 400(red)-700nm)violet) White light produced when source
emits equal quantities of energy
●● Candlepower (cp)
Answer: Unit of luminous intensity approximately equal to the
horizontal light output from an ordinary wax candle
●● lumen (lm)
Answer: =brightness
the unit of luminous flux equal to the flux in a unit solid angle of one
steradian from a uniform point source of one candlepower
●● illumenance
Answer: the density of luminous flux incident on a surface in lumens per
area
●● lunimance
,Answer: also aka brightness
luminous flux per unit of projected area and unit solid leaving a surface,
either reflected or transmitted. Takes into account the reflectance and
transmittance properties of materials and direction they are viewed.
●● luminous intensity
Answer: the solid angular flux density in a given direction measured in
candlepower or candelas
●● direct glare
Answer: results when a light source in the field of vision causes
discomfort and interference with the visual task
●● visual comfort probability (VCP)
Answer: A metric used in evaluating the problem of direct glare. The
VCP is the percentage of normal observers who may be expected to
experience visual comfort in a particular environment with a particular
lighting situation.
●● critical glare zone for direct glare
Answer: area 45 degrees right above light source
●● reflected glare
, Answer: occurs when a light source is reflected from a viewed surface
into the eye, aka veiling reflection
●● angle of incidence is equal to the
Answer: angle of reflection
●● contrast
Answer: the difference in illumination level between one point and
nearby points
●● brightness ratios should be limited to
Answer: 3:1 between task and immediate surroundings(paper and the
desk top)
5:1 task and general surroundings
10:1 task and remote surroundings
●● unifoirmity
Answer: of lighting affects comfort of space, uniform lighting is not
desirable unless you are drafting or machine work. Some shade and
shadow provides highlights and interest
●● color in lighting
Answer: an interaction between the color of the light source and the
color of the objects that reflect the light
