T
E
L
KO
M
NIK
A
, V
ol
.
1
7
,
No.
5
,
O
c
tob
er
201
9
, p
p.
2
51
2
~
2516
IS
S
N: 1
69
3
-
6
93
0
,
accr
ed
ited
F
irst
Gr
ad
e b
y K
em
en
r
istekdikti,
Decr
ee
No: 2
1/E/
K
P
T
/20
18
DOI:
10.12928/TE
LK
OM
N
IK
A
.v
1
7
i
5
.
11391
◼
25
12
Rec
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c
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O
3:E
u3+ p
ho
s
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r o
n t
he co
lor
qu
ali
t
y
and
l
um
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no
us ef
ficac
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he 70
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W
-
LE
Ds
V
an
-
Du
c
P
h
an
1
, M
inh
T
r
an
2
, Le
A
n
h
V
u
*
3
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ang
-
Nam Ng
u
y
en
4
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T
r
an T
h
anh
T
r
ang
5
1
Cen
te
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f
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c
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i
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e
n
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i
M
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e
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a
m
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a
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strac
t
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th
i
s
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d
y
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w
e
i
n
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e
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g
a
te
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e
e
ff
e
c
t
o
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t
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p
h
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s
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h
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th
e
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o
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n
d
e
r
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g
In
d
e
x
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RI),
Col
o
r
Q
u
a
l
i
ty
S
c
a
l
e
(CQ
S
)
a
n
d
L
u
m
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n
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u
t
p
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t
(L
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o
f
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e
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p
p
a
c
k
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L
EDs
(
IP
W
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L
EDs
).
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e
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y
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s
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s
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t
To
o
l
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w
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re
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By
v
a
ry
i
n
g
th
e
c
o
n
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e
n
tr
a
ti
o
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o
f
th
e
r
e
d
p
h
o
s
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m
0
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to
0
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3
6
%
,
w
e
u
s
e
th
e
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i
g
h
t
To
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l
s
s
o
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t
o
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n
v
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s
ti
g
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te
t
h
e
CR
I,
CQ
S,
a
n
d
L
O
o
f
th
e
7
0
0
0
K
IP
W
-
L
EDs
.
Fr
o
m
th
e
re
s
e
a
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e
s
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l
t
s
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t
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a
n
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a
t
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I
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n
d
CQ
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c
a
n
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n
c
re
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s
e
d
to
8
5
a
n
d
7
1
,
re
s
p
e
c
t
i
v
e
l
y
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Howe
v
e
r,
th
e
L
O
h
a
s
a
d
e
c
r
e
a
s
e
i
n
th
e
i
n
c
re
a
s
i
n
g
tre
n
d
o
f
t
h
e
re
d
p
h
o
s
p
h
o
r
c
o
n
c
e
n
tr
a
ti
o
n
.
Th
i
s
p
a
p
e
r
p
r
o
v
i
d
e
s
t
h
e
n
e
w
re
c
o
m
m
e
n
d
a
t
i
o
n
fo
r t
h
e
m
a
n
u
f
a
c
tu
r
i
n
g
o
f
th
e
I
P
W
-
L
ED
s
.
Key
w
ords
:
CQ
S,
CR
I,
IP
W
-
L
EDs
,
L
O
,
re
d
p
h
o
s
p
h
o
r
Copy
righ
t
©
2
0
1
9
Uni
v
e
rsi
t
a
s
Ahm
a
d
D
a
hl
a
n.
All
rig
ht
s
r
e
s
e
rve
d
.
1.
Int
r
o
d
u
ctio
n
In
the
h
i
s
tor
y
of
hu
m
an
de
v
el
op
m
en
t,
l
i
gh
t
i
ng
s
o
u
r
c
es
ha
v
e
b
ee
n
c
h
an
g
ed
f
r
o
m
c
ol
l
ec
t
i
ng
n
atu
r
a
l
f
i
r
e
s
ou
r
c
es
f
r
o
m
dril
l
i
ng
w
o
od
to
to
r
c
h,
oi
l
l
am
p,
to
the
c
an
dl
e,
an
d
l
ate
r
to
the
w
i
de
l
y
us
ed
k
eros
en
e
l
am
p,
an
d
no
w
to
whi
te
L
E
Ds
(
W
-
LE
Ds
)
[1]
.
No
w
a
da
y
s
,
W
-
LE
Ds
i
s
c
on
s
i
de
r
e
d
an
es
s
en
ti
al
s
ol
ut
i
o
n
f
or
r
ep
l
ac
i
n
g
tr
ad
i
ti
on
a
l
l
i
gh
t
i
n
g
s
ou
r
c
es
ba
s
e
d
on
ex
c
el
l
e
nt
propert
i
es
f
or
di
s
p
l
a
y
t
ec
hn
o
l
og
y
,
i
nc
l
ud
i
ng
hi
gh
b
r
i
gh
tn
es
s
,
l
o
w
p
o
w
er
c
o
n
s
u
m
pti
on
,
l
o
ng
l
i
f
eti
m
e,
f
as
t
r
es
po
ns
e
as
wel
l
as
c
l
i
m
ate
i
m
pa
c
t
r
es
i
s
tan
c
e
[
2
].
T
he
m
ai
n
r
es
ea
r
c
h
di
r
ec
t
i
on
i
n
W
-
LE
Ds
i
s
i
m
prov
i
n
g
t
he
i
r
l
i
gh
t
i
n
g
p
erf
or
m
an
c
e
i
n
te
r
m
of
the
CCT
de
v
i
at
i
on
(
D
-
CCT
)
,
Col
or
Rend
erin
g
Ind
ex
(
CRI)
,
Col
or
Q
ua
l
i
t
y
S
c
al
e
(
CQ
S
)
a
n
d
Lu
m
en
O
utp
ut
(
LO
)
.
A
ut
ho
r
s
i
n
[3
]
tr
i
e
d
to
en
ha
nc
i
ng
the
D
-
CCT
of
W
-
LE
Ds
b
y
a
d
d
i
ng
S
i
O
2
po
wder
wi
th
s
u
i
ta
bl
e
c
o
nc
en
tr
at
i
on
to
the
ph
os
ph
or
l
a
y
er,
bu
t
t
he
l
um
en
ou
tpu
t
ha
d
a
c
o
ns
i
d
erabl
e
de
c
r
ea
s
e.
O
n
an
ot
h
er
w
a
y
,
t
he
LO
of
the
W
_L
E
Ds
c
an
be
i
m
prov
ed
s
i
g
ni
f
i
c
an
t
l
y
b
y
c
o
-
do
p
i
n
g
th
e
gree
n
Ce0.
6
7
T
b0
.33
Mg
A
l
1
1
O
19
:
Ce,
T
b
ph
os
ph
or
t
o
th
e
ph
os
ph
or
c
om
p
ou
nd
i
n
g
as
s
ho
wn
i
n
[
4].
F
or
the
pu
r
p
os
e
of
i
m
prov
i
ng
t
he
CRI
of
th
e
W
-
LE
Ds
,
au
tho
r
s
i
n
[5,
6]
propos
e
d
to
m
i
x
the
r
ed
ph
os
ph
ors
to
the
h
i
gh
C
RI
m
ul
ti
-
c
hi
p
W
-
LE
Ds
[7]
us
ed
gre
en
(
B
a,
S
r
)
2S
i
O
4:
E
u2
+
an
d
r
ed
C
aA
l
S
i
N3:
E
u2
+
pho
s
ph
ors
w
i
th
v
ario
us
p
ac
k
ag
es
W
-
LE
Ds
to
e
nh
a
nc
e
the
CR
I
a
nd
[8]
s
ho
wed
th
e
m
i
s
s
i
ng
r
ed
c
o
m
po
ne
nt
i
n
ph
os
ph
or
-
c
o
nv
ert
ed
W
-
LE
Ds
f
or i
m
prov
i
ng
i
ts
op
t
i
c
al
prop
erti
es
.
In
th
i
s
r
es
e
arc
h,
w
e
i
nv
es
ti
ga
te
the
i
nf
l
ue
nc
e
of
th
e
r
e
d
Y
2O
3:
E
u3
+
ph
os
ph
or
pa
r
ti
c
l
es
’
c
on
c
en
tr
at
i
on
on
th
e
o
pti
c
al
propert
i
es
i
n
term
of
C
RI,
CQ
S
,
a
nd
LO
of
th
e
70
00
K
i
n
-
c
up
pa
c
k
ag
i
ng
w
h
i
te
L
E
Ds
(
I
P
W
-
LE
Ds
)
.
T
he
m
ai
n
c
o
ntri
bu
ti
o
n
of
the
r
es
ea
r
c
h
pa
pe
r
c
a
n
be
s
u
m
m
ariz
ed
as
t
he
f
ol
l
o
wi
n
gs
:
−
T
he
ph
y
s
i
c
al
m
od
el
of
the
70
00
L
IP
W
-
LE
Ds
ba
s
ed
on
the
r
e
al
W
-
LE
Ds
i
s
s
i
m
ul
ate
d
b
y
the
L
i
g
ht
T
oo
l
s
.
−
T
he
i
nf
l
ue
nc
e
of
the
r
ed
p
ho
s
ph
or
pa
r
ti
c
l
es
’
c
o
nc
en
t
r
ati
on
on
t
he
C
RI,
CQ
S
,
a
nd
LO
i
s
i
n
v
es
ti
ga
te
d a
nd
d
eri
v
ed
b
y
v
ar
y
i
n
g t
h
e red
ph
os
ph
or c
on
c
en
tr
at
i
o
n f
r
om
0
to
0.3
6
%.
Evaluation Warning : The document was created with Spire.PDF for Python.
T
E
L
KO
M
NIK
A
IS
S
N: 1
69
3
-
6
93
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◼
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t
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th
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or qu
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ty
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d
l
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s
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(
V
an
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D
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2513
−
T
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m
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on
r
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l
t
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a
l
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s
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M
i
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T
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B
ee
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La
m
be
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t L
a
w.
T
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r
es
t
of
th
i
s
wor
k
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s
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wn
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l
o
w.
T
he
r
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r
c
h
m
eth
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s
dra
w
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i
n
t
he
s
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s
ec
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i
ng
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i
gh
t
T
oo
l
s
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T
he
thi
r
d
s
ec
ti
on
pro
po
s
es
the
n
um
eric
al
r
es
ul
ts
,
an
al
y
t
i
c
al
ex
pres
s
i
on
an
d s
om
e d
i
s
c
u
s
s
i
on
s
. Fi
n
al
l
y
,
s
om
e c
on
c
l
us
i
on
s
i
s
s
um
m
a
r
i
z
ed
i
n
th
e l
as
t s
ec
t
i
on
.
2.
Re
se
a
r
ch M
eth
o
d
In
thi
s
s
ec
ti
o
n,
w
e
us
e
th
e
r
ea
l
I
P
W
-
LE
Ds
as
s
ho
wn
i
n
F
i
g
ure
1
(
a)
f
or
c
on
du
c
ti
ng
the
p
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y
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i
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al
m
od
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of
the
7
00
0
K
I
P
W
-
LE
Ds
b
y
L
i
g
ht
T
oo
l
s
as
i
n
F
i
gu
r
e
1
(
b).
In
t
hi
s
s
i
m
ul
ati
on
s
tag
e,
the
d
ep
t
h,
the
i
nn
er
an
d
ou
ter
r
ad
i
us
of
the
r
ef
l
ec
tor
are
s
e
t
t
o
be
2.0
7
m
m
,
8
m
m
,
an
d
9.8
5
m
m
,
w
i
t
h
t
he
f
i
x
ed
t
h
i
c
k
ne
s
s
of
0.0
8
m
m
an
d
2
.07
m
m
,
r
es
pe
c
ti
v
e
l
y
,
c
ov
er
ni
ne
c
h
i
ps
.
T
he
bl
ue
LE
D
c
hi
p
h
as
a
d
i
m
en
s
i
on
of
1.1
4
m
m
x
0.1
5
m
m
. T
he
r
ad
i
a
nt
f
l
ux
of
ea
c
h
bl
u
e
c
hi
p
i
s
1.1
6
W
,
an
d
the
pe
ak
w
av
e
l
e
ng
th
i
s
45
3
nm
.
T
he
ph
os
ph
or
l
a
y
ers
c
on
s
i
s
t
of
Y
A
G
:
Ce,
Y
2O
3:
E
u
3+
p
o
w
d
ers
an
d
t
he
s
i
l
i
c
on
e
m
atri
x
.
T
he
i
r
r
ef
r
ac
ti
v
e
i
n
de
x
es
are
s
et
to
be
1.8
3,
1.9
3,
an
d
1.5
0
,
r
es
pe
c
ti
v
e
l
y
.
M
e
an
w
h
i
l
e,
th
e
m
ea
n
r
ad
i
i
of
ph
os
ph
or
po
wders
are
7.2
5
µm
,
s
a
m
e
a
s
r
ea
l
p
arti
c
l
e s
i
z
e [
9
-
15
]
.
(
a)
(
b)
F
i
gu
r
e
1.
(
a) C
P
W
-
LE
Ds
(
b) Ph
y
s
i
c
al
m
od
el
3.
Nu
me
r
ica
l
E
xa
mp
l
es
a
n
d
D
isc
u
s
sion
F
i
gu
r
e
2
i
l
l
us
tr
a
tes
t
he
i
nf
l
ue
nc
e
of
the
c
on
c
e
ntrat
i
on
of
the
r
ed
ph
os
ph
or
pa
r
t
i
c
l
e
o
n
the
CRI
of
the
7
00
0
K
I
P
W
-
LE
Ds
.
In
t
hi
s
F
i
g
ure
th
e
c
on
c
en
tr
at
i
on
of
the
r
ed
ph
os
ph
or
pa
r
t
i
c
l
es
v
ari
es
c
on
t
i
n
uo
us
l
y
f
r
om
0
%
to
0.
36
%.
F
r
om
the
r
es
ul
ts
,
we
c
an
s
ee
th
at
the
CRI
i
nc
r
ea
s
es
c
r
uc
i
al
l
y
f
r
om
68
to
ne
ar
85
w
h
en
t
he
c
on
c
e
ntrat
i
on
of
the
r
ed
p
ho
s
ph
or
v
ari
es
f
r
o
m
0%
to
0.2
8%.
A
f
ter
t
ha
t,
th
e
C
RI
f
al
l
s
wi
t
h
t
he
c
o
nc
en
tr
a
ti
o
n
of
the
r
e
d
p
ho
s
p
ho
r
f
r
om
0.2
8%
t
o
0.3
6%
.
T
he
m
ax
i
m
al
v
a
l
ue
of
the
CRI
c
an
be
ob
ta
i
n
ed
a
t
85
wi
th
0.2
8
%
to
0.3
0%
c
on
c
en
tr
at
i
o
n
of
the
r
e
d
ph
os
p
ho
r
pa
r
ti
c
l
es
.
M
oreo
v
er,
the
C
Q
S
of
th
e
7
00
0K
IP
W
-
LE
Ds
v
ers
us
the
c
on
c
e
ntrat
i
on
of
the
r
e
d
ph
os
p
ho
r
pa
r
t
i
c
l
es
i
s
pl
ott
e
d
i
n
F
i
g
ure
3
wi
th
the
c
on
c
en
tr
at
i
on
f
r
o
m
0%
to
0
.36
%
.
S
i
m
i
l
ar
to
th
e
ab
o
v
e
c
as
e,
th
e
CQ
S
r
i
s
e
f
r
o
m
66
to
71
wi
th
i
nc
r
ea
s
i
n
g
th
e
r
ed
ph
os
ph
or
c
on
c
en
tr
a
ti
on
f
r
om
0%
to
0.2
8
%
an
d
the
n
f
al
l
s
s
i
gn
i
f
i
c
an
tl
y
w
h
en
t
he
r
ed
ph
os
p
ho
r
c
on
c
en
tr
at
i
on
i
nc
r
ea
s
es
f
urther.
T
he
m
ax
i
m
al
v
a
l
ue
of
the
CQ
S
i
s
71
w
i
th
0.2
8%
to
0.3
0%
r
e
d
ph
os
ph
or
c
on
c
e
ntrat
i
on
.
A
l
l
t
he
s
e
r
es
ul
ts
c
an
be
ac
hi
ev
ed
w
i
t
h
i
nc
r
ea
s
i
n
g
of
th
e
r
e
d
ph
os
ph
or c
on
c
en
tr
ati
on
.
F
i
gu
r
e
4
pr
es
en
ts
t
he
ef
f
e
c
t
of
the
r
ed
ph
os
ph
or
p
art
i
c
l
es
’
c
on
c
en
tr
ati
on
on
t
he
LO
of
the
7
00
0K
IP
W
-
LE
Ds
i
n t
h
e
c
on
ne
c
t
i
on
of
i
nc
r
ea
s
i
ng
th
e red
ph
os
p
ho
r
c
o
nc
en
tr
at
i
on
f
r
om
0% to
0.3
6%.
F
r
om
F
i
g
ure
4
,
i
t
c
an
be
ob
s
er
v
ed
tha
t
the
LO
f
al
l
s
c
r
uc
i
a
l
l
y
wi
th
i
nc
r
ea
s
i
n
g
th
e
r
ed
ph
os
ph
or
c
on
c
e
ntrat
i
on
.
W
e
c
an
j
u
s
ti
f
y
the
s
e
r
es
ul
ts
b
as
ed
on
the
r
el
ati
o
ns
hi
p
be
t
wee
n
l
um
i
no
us
ou
t
pu
t
a
nd
t
h
e
Y
2O
3
:E
u
3+
s
i
z
e
ac
c
ordi
n
g
to
M
i
e
-
s
c
att
er
i
ng
the
or
y
an
d
the
B
ee
r
-
La
m
be
r
t l
a
w
[1
, 1
2,
16
-
2
6].
Evaluation Warning : The document was created with Spire.PDF for Python.
◼
IS
S
N: 16
93
-
6
93
0
T
E
L
KO
M
NIK
A
V
ol
.
1
7
,
No
.
5
,
O
c
tob
er
20
19
:
25
1
2
-
25
16
2514
F
i
gu
r
e
2.
CR
I
F
i
gu
r
e
3.
CQ
S
F
i
gu
r
e
4.
LO
0
)
(
ext
I
I
e
x
p
µ
L
=−
(
1)
w
he
r
e
I
i
s
th
e
tr
a
ns
m
i
tte
d
l
i
gh
t
p
o
w
er,
I
0
i
s
t
he
i
nc
i
de
n
t
l
i
gh
t
po
wer
,
µ
e
x
t
=
N.
C
e
x
t
i
s
the
ex
ti
nc
t
i
on
c
oe
f
f
i
c
i
en
t,
L
i
s
th
e
pa
th
l
en
gth
,
an
d
N
i
s
th
e
nu
m
be
r
of
pa
r
t
i
c
l
es
pe
r
c
ub
i
c
m
i
l
l
i
m
ete
r
.
A
c
c
ord
i
ng
to
M
i
e
-
s
c
att
er
i
ng
the
or
y
,
the
ex
ti
nc
t
i
on
c
r
os
s
s
ec
ti
on
C
e
x
t
of
ph
os
ph
or
pa
r
t
i
c
l
es
c
an
be
c
ha
r
ac
teri
z
ed
b
y
the
f
ol
l
o
w
i
ng
e
qu
at
i
o
n:
Evaluation Warning : The document was created with Spire.PDF for Python.
T
E
L
KO
M
NIK
A
IS
S
N: 1
69
3
-
6
93
0
◼
E
ffe
c
t
of
r
ed
Y
2O
3:E
u3
+
p
h
os
ph
or o
n
th
e c
ol
or qu
al
i
ty
an
d
l
um
i
n
ou
s
...
(
V
an
-
D
uc
P
ha
n)
2515
2
2
1
2
(
2
1
)
R
e
(
)
e
x
t
n
n
n
a
C
n
a
b
x
=
=
+
+
(
2)
Her
e,
x
=
2
π
a/λ
i
s
the
s
i
z
e
pa
r
am
ete
r
;
an
an
d
bn
ar
e
the
ex
pa
ns
i
o
n
c
oe
f
f
i
c
i
en
ts
w
i
t
h
ev
e
n s
y
m
m
etr
y
a
nd
od
d
s
y
m
m
etr
y
, res
p
ec
ti
v
el
y
.T
he
p
aram
ete
r
s
a
n
a
nd
b
n
are
de
f
i
ne
d a
s
:
(
3)
(
4)
where
a
i
s
th
e
s
ph
eric
a
l
pa
r
ti
c
l
e
r
a
di
us
,
λ
i
s
th
e
r
el
at
i
v
e
s
c
att
erin
g
w
a
v
el
e
ng
th
,
m
i
s
the
r
ef
r
ac
ti
v
e
i
n
de
x
of
s
c
att
erin
g
p
arti
c
l
es
,
an
d
,
are
the
R
i
c
c
ati
-
B
es
s
el
f
un
c
ti
on
s
[1
6
-
22].
4.
Co
n
clus
ion
In
th
i
s
s
tud
y
,
w
e
i
nv
es
ti
g
at
e
th
e
ef
f
ec
t
of
c
on
c
en
tr
a
t
i
o
n
of
the
r
ed
Y
2O
3:
E
u3
+
ph
os
ph
or
on
the
c
o
l
or
r
en
d
erin
g
i
n
de
x
(
CRI)
,
Col
or
Q
ua
l
i
t
y
S
c
al
e
(
CQ
S
)
an
d
L
um
en
O
utp
ut
(
LO
)
of
the
70
0
0K
i
n
-
c
up
pa
c
k
ag
i
ng
w
h
i
te
L
E
Ds
(
I
P
W
-
LE
Ds
)
.
T
he
ph
y
s
i
c
al
m
od
el
of
the
7
00
0
K
IP
W
-
LE
Ds
i
s
c
on
d
uc
ted
b
y
L
i
gh
t
T
oo
l
s
s
of
tware.
B
y
v
ar
y
i
n
g
th
e
c
on
c
en
tr
ati
o
n
of
the
r
e
d
ph
os
ph
or
f
r
o
m
0%
to
0.3
6
%,
we
us
e
t
he
Li
g
ht
T
oo
l
s
s
of
tw
are
t
o
i
n
v
es
t
i
ga
te
t
he
CRI,
CQ
S
,
an
d
LO
of
the
70
00
K
IP
W
-
LE
Ds
.
F
r
o
m
the
r
es
ea
r
c
h
r
es
ul
ts
,
i
t
c
an
b
e
ob
s
er
v
e
d
tha
t
the
CRI
an
d
CQ
S
c
a
n
be
i
nc
r
ea
s
e
d
t
o
8
5
an
d
7
1,
r
es
p
ec
ti
v
e
l
y
.
Ho
w
e
v
er,
t
he
LO
ha
s
a
d
ec
r
ea
s
e
i
n
the
i
nc
r
e
as
i
ng
tr
e
nd
of
the
r
ed
ph
os
ph
or
c
on
c
e
n
tr
ati
o
n.
T
hi
s
pa
pe
r
pro
v
i
de
s
t
he
ne
w
r
ec
om
m
en
da
ti
o
n f
or the
m
an
uf
ac
turi
ng
of
th
e I
P
W
-
LE
D
s
.
Ref
er
en
ce
s
[1
]
L
i
u
S
,
X
-
B
L
u
o
.
L
ED
Pa
c
k
a
g
i
n
g
fo
r
L
i
g
h
t
i
n
g
Ap
p
l
i
c
a
ti
o
n
s
:
De
s
i
g
n
,
M
a
n
u
fa
c
tu
r
i
n
g
a
n
d
T
e
s
ti
n
g
.
Che
m
i
c
a
l
I
n
d
u
s
try
Pre
s
s
a
n
d
J
o
h
n
W
i
l
e
y
&
So
n
s
,
B
e
i
j
i
n
g
.
2
0
1
1
.
[2
]
M
i
n
h
,
T
ra
n
Hoa
n
g
Q
u
a
n
g
,
Ng
u
y
e
n
Huu
Kh
a
n
h
Nha
n
,
Ngu
y
e
n
Doa
n
Q
u
o
c
An
h
,
a
n
d
Hs
i
a
o
-
Y
i
L
e
e
.
Red
-
Em
i
t
ti
n
g
α
-
SrO
·3
B2
O
3
:S
m
2
P
h
o
s
p
h
o
r:
a
n
I
n
n
o
v
a
ti
v
e
Ap
p
l
i
c
a
ti
o
n
fo
r
In
c
re
a
s
i
n
g
Co
l
o
r
Q
u
a
l
i
ty
a
n
d
L
u
m
i
n
o
u
s
Fl
u
x
o
f
Rem
o
te
Ph
o
s
p
h
o
r
W
h
i
te
L
EDs
.
J
o
u
rn
a
l
o
f
th
e
Ch
i
n
e
s
e
I
n
s
t
i
tu
te
o
f
En
g
i
n
e
e
rs
.
2
0
1
7
;
4
0
(4
)
:
3
1
3
–
3
1
7
.
[3
]
L
L
o
h
a
u
s
,
E
L
e
i
c
h
t
,
S
Di
e
tri
c
h
,
R
W
u
n
d
e
r
l
i
c
h
,
S
Hei
n
e
n
.
A
d
v
a
n
c
e
d
c
o
l
o
r
c
o
n
tro
l
fo
r
m
u
l
t
i
c
o
l
o
r
L
E
D
i
l
l
u
m
i
n
a
ti
o
n
s
y
s
te
m
s
wit
h
p
a
r
a
m
e
tri
c
o
p
ti
m
i
z
a
ti
o
n
.
In
Pro
c
e
e
d
i
n
g
s
o
f
I
n
te
rn
a
ti
o
n
a
l
Con
f
e
re
n
c
e
o
n
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