Osram HQI-E 150 W/NDL CL Technical Information download pdf (Page 50)

5

0

reducing the level o

f

melatonin in the bloodstream.

T

his is called melatonin suppression.

(

see Fi

g

. 53

)

.

S

cientific studies on how li

g

ht forms or suppresses the

s

l

eep

i

n

g

h

ormone me

l

aton

i

n

h

ave s

h

own t

h

at to

g

et

h

er

with the visual

p

ath which is res

p

onsible for vision,

there is also a non-visual

p

ath which, inde

p

endent o

f

t

h

e v

i

sua

l

s

y

stem, contro

l

s me

l

aton

i

n pro

d

uct

i

on an

d

therefore the circadian rhythm

(

dayli

g

ht rhythm

).

While the visual path leads directl

y

f

rom the e

y

e to the

vision center o

f

the brain via the o

p

tic nerve, the non-

v

i

sua

l

pat

h

i

s coup

l

e

d

v

i

a t

h

e suprac

hi

asmat

i

c nuc

l

eus

(SC

N

)

to the pineal

g

land and controls melatonin pro-

d

uct

i

on.

Thi

s process

i

s re

l

at

i

ve

ly

s

l

ow,

i

n t

i

me con

-

stants o

f

several minutes, while the

p

rocess o

f

vision

takes

p

lace within a

f

ew 10 ms

.

T

he

SC

N is a collection of several thousand nerve

cells, located above the intersection o

f

the optic

n

erves

(

chiasma

)

. This is deemed toda

y

to be the main

re

g

ulator of the inner clock

(

master clock

)

.

Retino-

hypothalamic

tract (RHT)

Suprachiasmatic

Nucleus (SCN)

Pineal gland

Spinal cord

Ganglion cell

in upper cervical

vertebra

Visual center

Light

Fi

g

. 53: How li

g

ht a

ff

ects on the human brain

has become

p

ossible due to additional ada

p

tation o

f

the H

CI

®

S

hopli

g

ht, which achieves the best colour ren

-

derin

g

properties o

f

all metal halide lamps. Fi

g

ure 49

s

hows the values o

f

the colour renderin

g

indices 1 to

14

f

or

f

our di

ff

erent lamp t

y

pes with the correlated co

-

lour temperature of 3000 K. The advantages can best

be seen

f

or colour renderin

g

index R9

f

or saturated

red, but the superiorit

y

of P

O

WERBAL

L

®

tec

h

no

l

o

g

y

i

s

also apparent

f

or the other colour renderin

g

indices

.

8

.

3

Li

g

h

t an

d

qua

li

ty o

f

lif

e

It has been a known

f

act

f

or man

y

y

ears that as well as

its known visual e

ff

ects, li

g

ht also has other biolo

g

ical

e

ff

ects on the human body. The most acknowled

g

ed

e

ff

ect is the way light in

f

luences the day-and-night

c

y

cle. This in

f

luence is also perceived b

y

the e

y

es, not

ho

w

e

v

e

r v

ia

t

he

v

isio

n

ce

nt

e

r

i

n t

he

b

r

ai

n

bu

t v

ia

o

t

he

r

nerve cells that a

ff

ect the pineal

g

land and hence the

f

ormin

g

o

f

the sleep hormone melatonin. Bri

g

ht li

g

ht

in the ni

g

ht suppresses the

f

ormation o

f

melatonin,

p

i

nea

l

g

l

an

d

r

elease

of

m

ela

t

o

n

in

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