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Physics
Radiometry
Radiometric Units
Flux
Angular flux density
Flux density
Flux density
Radiant energy
Radiant power
Radiance
Irradiance
Radiosity
Radiant intensity
joules [J = kg m 2 /s 2 ]
watts [W = joules/s]
[W/m 2 sr]
[W/m 2 1
[W/m 2 ]
[W/sr]
Physics
Photometry
Photometric Units
Flux
Angular flux density
Flux density
Flux density
Luminous energy
Luminous power
Luminance
Illuminance
Luminosity
Luminous intensity
talbot
lumens [talbots/second]
Nit [umens/m2 sr]
Lux [lumens/m2sri
Lux [lumens/m 2 sr
Candela [lumens/sr]
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( VCC)
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0I
gure 8.22
w (steradians)
BCD luminance versus source solid angle.
Solid angle (steradians)
1ilvWha^GMC
oF1ourcf
Cone angle (degrees)
5.0
3.0
2.0
78.2
58.5
47.0
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0.3
Mluliple soarces
ncec
Experleet
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te proJitzcL Frm.
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reJer inlerance of 3g r Fr lv*sy,as
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TABLE VI - Comparison of Glare Indices for
artificial light (IES GI) and daylight (DGI)
Glare Citerion
IES GI
DGI
Just imperceptible
10
13
16
19
22
25
28
16
18
20
22
24
26
28
Just uncomfortable
Just intolerable .
T
paleem
,M
c~p,,d; mt +e sly llr6,wLc-q.
Just acceptable
tie ccls/rr
(F
ISclkccll,
Consider a rw.
12
12
6
t
ra4 Cicac .
.
6Ol4NO
IS
Tu#X perpeAJ lx Lr
L
daStsce O•
W1
Figure 17- The relationshipbetween daylight-glare
index andwindow sizefor sky luminancesbetween
1600 and 8900 cd/m2 . The window is viewedfrom a
perpendiculardistance of 6m in a room of
dimensions 12m x 12m x 6m. Resultsforaverage
reflectance of 0.4 (17).
r)/
II-"]: =2
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L,
or O. 4
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