Functional light and what about - PowerPoint Presentation

Slide1

Functional light and what about health?

Norms and measurementsSlide2

Healthy light

DIN SPEC 67600:2013-04Biologically effective illumination, design guidelines

DIN SPEC 5031-100:2015-08

Measurement using the eye, of the

melanopic

effect of light on humans: variables, formula symbols and

actionspectrumSlide3

Biologically effective light can be healthy

The following positive effects

Stabilization of

human circadian system

Synchr

.

sleep-wake

with 24 hour

day-night

Re-

inforcement

of amplitude of

biol.

c

lock

Activation and improvement of

concentration

Facilitation and fostering of

regeneration

Improvement

moods

Strengthening

immune system

Note: to be applied to right time of the day!Slide4

Human circadian system

Biological rhythm of about 1 day length, variations inbody temperature

hormone

descretion

r

hythm of heart

a

ctivity and rest

Light can affect it and reset the timing of itSlide5

DIN SPEC 67600:2013-04

Observations but not further considered hereLight enters human not only via eyes (skin, hair roots)

Production of

Vit

-D done by UV-B

Focus in norm on

Non-visual effects of light transmitted through the eyes

Design guidelines fo

r living spaces (extended stay)

Statement: bio. effective light is not related to energy efficiency of visual

light

 keep separate

Statement: better to use

melanopic

effects since normal vision is not considere

d (in biologic effects normal vision is included).Slide6

Melanopic effectiveness

Minimum 250 lux as vertical illuminance on the eye

At

Tc

= 8000 K (at eye) of a fluorescent TL

Beware of reflections and filtering!

Several hours of exposure a day

Preferably in the morning

Solid angle of light source is important

< 0.1

sr

no effect (20

deg

view angle)

> 0.1

sr

and < 0.5

sr

effect increases

> 0.5

sr

good effect (46

deg

view angle)

Coming from above or upper part of visual fieldSlide7

Office space

200lx_vert@3000K

Dependent on visual task (EN 12464-1) (also

lx_horiz

)

250lx_vert@8000KSlide8

Classroom i

200lx_vert@3000K

Dependent on visual task (EN 12464-1). See example for school day.Slide9

Class-room ii

650lx_horiz@12000K (

synchr

biol.

c

lock)

300lx_horiz@4000K (normal lesson)

1000lx_horiz@6000K (test/concentration work)

300lx@2700K (calming after test)

650lx@12000K (activate after lunch)Slide10

DIN SPEC 5031 -100:2015-08

a_mel_v

=

melanopic

factor for visual radiation

A: Determine

melanopic

effect of light with spectrum

X_λ

B: Determine visual effect of light with

spectrum

X_λ

Divide A/B to get

a_mel_v

s_mel

(

λ

)Slide11

Example

a_mel_vSlide12

Example

a_mel_vSlide13

a_mel_v in practice

Reference values:

From 67600: 250

lux_vert

for 8000K fluorescent TL

a

_mel_v

= 0.867

From 67600: 200

lux_vert

for 3000K light

a_mel_v

= 0.387

Given any lamp, once spectrum is determined we calculate the

a_mel_v

Compare to

a_mel_v

of 8000K

Tl

for which a recommendation exists, determine relation

Then change 250lx_vert into lux for any lamp using relationSlide14

a

_mel_v

in practice ii

a_mel_v_NOTEii

/a_mel_v_8000KTL= 1.015/0.867=1.17

So needed 250/1.17= 214

lux_vert

 simulate

Dialux

!Slide15

Pupil and transmission effects

Correction factor based on Age:

k_mel

(A)

k_mel

(A)=

k_mel,trans

(A)*

k_mel,pupil

(A)

Trans = transmission through eye medium

Pupil = pupil size

a_mel_v

(A)=

a_mel_v

(32)*

k_mel

(A)

k_trans

values for 8000K TL: 1.055 (25yr), 1.000 (32yr), 0.825 (50yr), 0.569 (75yr), 0.437 (90yr)Slide16

Spectral transmission effectSlide17

Pupil effectSlide18

OliNo at LED-EXPO

Take your lamp and we measureFlicker content

Colo

r spectrum with CRI and CQS

Blue Light Hazard

For more explanations

For lamp measurement info