How to Design Office Lighting| Attention Points of Office Lighting | Mihouse

6 Aspects Requirements for Office Lighting Solution Design

23/09/2019
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Led lighting solution design for Mall, hospitality, high class club are commonly mentionable thanks to interior illumination design, Best economic benefits can bring for high-end atmospheric grade lighting design combine with high-end atmospheric grade applications. However, office lighting is easily neglected in contrast to other led lighting applications.

Actually, office illumination design is important for a whole day effective working.

1.Illuminance

International Architect Illumination Design drew up specific standards for office led lighting solution design as following table.

Office Architect Illumination Standard Value Table

Room or spaceReference Surface or HeightLux Standard ValueUGRUoRa
Standard Office0.75m Surface300190.680
Luxury Office0.75m Surface500190.680
Meeting Room0.75m Surface300190.680
Video Meeting Room0.75m Surface750190.680
Reception Room/Desk0.75m Surface200__0.480
Service / Business Hall0.75m Surface300220.480
Design officeActual working surface500190.680
Doc Sort Copy and Issue Room0.75m Surface300__0.480
Archive Room0.75m Surface200__0.480

This table is compatible for all kinds of architect office lighting design and other similar lighting applications.

office Light distribution

There are national standard for office lighting solution, instead of office lighting installation design at will. i.e. the illumination standard is 300 lx for general office lighting solution design, if it is too low that will result in unclear reading, easy fatigue, low working enthusiasm and becoming tired. If Illuminace is overhigh that will bring about raising burden of eyes lead to eyesore and waste of resource.

However, illuminance of the standard is not for the whole office lighting, but for working area merely, the other space illuminance lux around working area can be lower in comparison to working area lighting illuminance lux, but must be subject to the following table standard.

Illuminance Lux of around Working Area

Illuminance Lux of Working AreaIlluminance Lux of Around Working Area
≥ 750500
500300
300200
≤ 200Same as Working Area Lux

Note: Around working area mean beyond 0.5m radius of working area

Background light of office

The illuminance lux for background area is not appropriate to lower one third of space lux around working area, otherwise will result in fatigue.

2.Correlated Color Temperature

Except for national standard luminance, CCT are also extremely important to office lighting solution design. too low CCT will lead to be tired for long time working in office, research datum show high CCT can enhance working efficiency, but overhigh CCT will result in two problems: 1. Keeping people in long time excitement will result in bad health. 2. overhigh CCT Led Light Source may bring about blue light harm. Generally 4000-5000k neutral light led light source are recommended for office lighting solution applicatgion.

Color temperature and scene

3.Blue Light Hazard

Blue Light Hazard

Lighting can divide into visible and invisible lights, the lighting wave for visible lights is 380nm~760nm and lighting wave range from 380nm~500nm which is called bule light can perceive by our retinal. Led is becoming the main lighting source of people gradually and its strong energy can penetrate the human cornea and lens to reach the retina, causing retinal pigment epithelium cells shrink and even die, The death of light-sensitive cells will result in permanent decrease or even complete loss of vision, the human eye lens absorbs part of the blue light and gradually becomes cloudy to form a cataract. Long time working in blue light ambience will lead to eye fatigue. WHO eye love association reported 30000 people become blind because of blue light radiation hazard in 2008 and issued a yellow warning say blue light potential threaten of radiation hazard is far more over the damage of Sudan red, melamine, SARS, HINI and it is unconscious damage for human being by the end of 2009 .

Why blue light hazard occurr to white light Correlate Color Temperature led light source for office lighting scenario design? because blue light Led Chip are used for most of the led light source to emit original blue light, blue light fluorescent powder stimulate YAG fluorescent powder in led bead to form yellow light which integrate with blue light become white light, the failed integration lead to blue light ( low CCT led Chip need with more fluorescent power and less blue light, otherwise for high CCT led chip). Blue light is not equal to blue light hazard, because blue light is consists of red, green and blue lights, the lost of blue light will result in distortion, IEC/TR 62778 classify blue light hazard into RG0/ RG1/ RG2/ RG3 ratings, RG0/ RG1 ratings are safe for led lights application. Blue lights hazard must be considerated to choose the led lightings compliant with RG0 or RG1 rating standard for office led lights pruchase solution.

4.Flicker

Led Lighting flicker is caused by light and shade of led lights, generally it can be classify into flicker under 100Hz which can be seen and Flicker 100Hz above which can not be seen, what we discuss is the latter.

Researcher stated though led lighting flicker is too fast to perceive, Frequency range from 100-160Hz still can be distinguish by organism retina with the help of Electroencephalograph observation, such as cat brain cell will be burned when frequency range from 100-120Hz, at the same time, 100Hz fluorescent light can cause office staff headache increase doubly

IEEE classify flicker of led light into the rating in the following chart sated the documents issued in 2005. The green color sector represent harmfulness free rating area, yellow color sector represent low risk rating area and over yellow color sector ( white color sector) means are unacceptable for led lighting flicker, specific min values of led lighting flicker ratio percentage for low risk and hazard free can refer to table1 and table2.

Led Lighting output light shape frequency is a important reference index as statistics stated in the above table and it can be calculate whether within the min values of fluctuation depth accordingly, actually, flicker free is not really meant without flicker, but in some certain high frequency, flicker is beyond human retina reaction and harmfulness free for eyeball.

 Flicker Limit

IEEE classify flicker of led light into the rating in the following chart sated the documents issued in 2005. The green cover area represent harmfulness free rating, yellow cover area represent low risk rating and over yellow cover area( white color sector) means are unacceptable for led lighting flicker, specific min values of led lighting flicker ratio percentage for low risk and hazard free can refer to table1 and table2.

Low Risk Area Frustrate Depth Limited Value

Lighting ouput Wave Frequency(F)Limited Value(%)
f≤ 8Hz0.2
8Hz< f ≤90Hz0.025 x f
90Hz <f ≤1250Hz0.08 x f
f >1250HzExempted

Non Risk Surface Area Frustrate Depth Limited Value

Lighting ouput Wave Frequency(F) Limited Value(%)
f≤ 10Hz 0.1
10Hz< f ≤90Hz 0.1 x f
90Hz <f ≤3150Hz (0.08/2.5) x f
f >3150Hz Exempted (High Frequency)

Led Lighting output light shape frequency is a important reference index as statistics stated in the above lists, can calculate whether within the min values of fluctuation depth accordingly. actually, flicker free is not really meant without flicker, but in some certain high frequency, flicker is beyond human…reaction and harmfulness free for eye.

5.Dazzle

Dazzle consists of direct and reflective dazzles.

Dazzle classification

So called direct dazzle as last graphic show is the light you can see within normal eyesight.

Dazzle of office

For example the left led lamps does not affect our reading for its diffuse reflection lighting form design though its inverted image can be seen on the screen,but the right lamp affect reading much with is focus lighting design.

6.Lighting adjustment and energy efficiency

Well natural light is the most energy efficient light of the best working efficient way for office led lighting design solution, however, natural light is merely for few office lighting for location or weather reasons, artificial lights are the replacement of natural light.
The ideal office is combine natural light and artificial light, the latter can be as a suitable lighting supplement when natural light is enough or not.

meeting room of office

Lighting adjustment is important for conference room, the projection, record and reading effect will be affect for high lighting brightness or switching off the lights when projector in use for meeting room. It is necessary for lighting adjustment vary to various led lighting applications need.

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