Instructions

HD2402 - 31 - V1.3
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if 11mrad ≤ Alpha < 100mrad ⇒
otherwise t_lim = 10
6
/ L
B_real
(c index satisfied)
if L
B_100
< 100 then t_lim > 10000s
(d index satisfied)
if Alpha < 11mrad ⇒
otherwise t_lim = 10
6
/ L
B_11
• Side d1 [m] - Side d2 [m] – Distance R [m]:
o Alpha_1 [rad] angle subtended by the source along side d1 (see following table).
o Alpha_2 [rad] angle subtended by the source along side d2 (see following table).
Note: Alpha_1 and Alpha_2 values are those perceived by the visual system and
are calculated starting from α_1, α_2 angles calculated uniquely from geometric
parameters.
α_1, α_2 Alpha_1 Alpha_2
α_1≥100, α_1≥100 2 x Tan
-1
(d1/2R) 2 x Tan
-1
(d2/2R)
11≤α_1<100, α_2≥100 2 x Tan
-1
(d1/2R) 100mrad
11>α_1, α_2≥100 11mrad 100mrad
11>α_1, 11≤α_2<100 11mrad 2 x Tan
-1
(d2/2R)
11≤α_1<100, 11≤α_2<100 2 x Tan
-1
(d1/2R) 2 x Tan
-1
(d2/2R)
α_1≥100, 11≤α_2<100 100mrad 2 x Tan
-1
(d2/2R)
11>α_1, 11>α_2 11mrad 11mrad
11≤α_1<100, 11>α_2 2 x Tan
-1
(d1/2R) 11mrad
α_1≥100, 11>α_2 100mrad 11mrad
o Alpha [rad] average angle subtended by the source calculated as the average of
Alpha_1 e Alpha_2. This angle must be known to be able to calculate the real ra-
diance perceived by human eye (CEI IEC 62471).
o Omega [sr] solid angle under which the rectangle is seen. Calculation can be per-
formed rigorously or approximately.
o L
B
(100mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 100mrad.
o L
B
(11mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 11mrad.
o L
B
(1.7mrad) [W/(m² sr)] radiance calculated assuming that the source angular
dimension is 1.7mrad.
o L
B
(real) [W/(m² sr)] real radiance calculated starting from the entered geomet-
ric parameters.