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L.T. Doulos, PhD, MSc, ldoulos@mail.ntua.gr

Lighting Design, Hellenic Open University

Photometry Laboratory, National Technical University of Athens

Efficient Indoor Lighting Design

Miramare Hotel, Limassol, Thursday 4 May 2017

1st International Conference Energy in Buildings, Cyprus

Who we are



Photometric, Electrical, Color, Spectral measurements


What we do

Measuring LED pilot installations in municipalities and national roads

Tunnel lighting (new installations, energy savings etc)

Maintenance http://lighting.ece.ntua.gr/

Lighting design is changing


More available information

Optical comfort

More and more efficient equipment, new technologies

Lighting control, sensors, dimmers

Energy savings and low maintenance costs

Smart buildings

Office Commercial buildings Hotel Industry Warehouses Hospital Entertainment (wine bars, coffee shops) Households

Efficient lighting design is more and more necessary

Lighting design and standards

12464-1, 2011. Light and lighting - Lighting of work places, Part 1: Indoor work places

Tip: Lighting simulation tools (RELUX, Dialux) have tables with the limits

Be careful: Dont place more luminaires than enough , for 500lux dont calculate 650lux For Greece: ... 6//14826 17/6/2008

Light design using 12464-1, 2011

Licht.de Guide to DIN EN 12464-1

An example

Glare index UGR

Color rendering index Ra

Color quality matters

Ra or CRI;

Using the LED spectrum and standard test strips, it is examined how the LED renders each standard colour

Color temperature and emotional response

Viitanen J., J. Lehtovaara, E. Tetri, L. Halonen. User Preferences in Office Lighting: A Case Study Comparing LED and T5 Lighting, Leukos, 9, 4, (2013) 261-290

Users noted as the most pleasant color temperature 4100 for 500lx Users noted that either5 fluorescent lamps or LED have the same emotional response

Kruithof, 1941

Photo biological hazards

Blue light hazard: increase distance from the source, no direct contact

Circadian disorder: Avoid cold color temperature after dusk

145, 1/9/2010, .. 82, 3075-3094 - Lighting Europe, February 2013

Photobiological hazards

Blue light hazard

R Infra Red hazard

UV Ultra Violet hazard

Circadian rhythm disorder

Special halogen lamps

LED, MH with clear tube

MH without filters


Can we use 12000K lamps?

Viitanen J., J. Lehtovaara, E. Tetri, L. Halonen. User Preferences in Office Lighting: A Case Study Comparing LED and T5 Lighting, Leukos, 9, 4, (2013) 261-290

Users reported as most pleasant color temperature close to 4100 and no difference between T5 lamps and LEDs (Office use, 500lux)

Luminous efficacy and T5 lamps (lm/W)

75,9 lm/W*

82,4 lm/W*

* Without taken account ballast



Luminous efficacy and LED (lm/W)

111,5 lm/W



101,6 lm/W

Luminous efficacy for luminaires (lm/W)

minimum value for Greece 55 lm/W

luminous flux of lamps

luminaire efficiency

luminous flux of


Power of lamp

Power of Ballast or driver

Power of luminaire

An example

8.900lm X 75,34%

2 X 54W + ballast

6.705lm 56,44 lm/W


82,4 lm/W**

** only lamp

* 20%-25% for electromagnetic ballast, 5%-10% for electronic ballast

More standards

Technical guidelines:

Illuminance levels

W/m2 (Greece: 16 W/m2 for lighting levels 500lx)

Daylight zones

Users schedules 12464-1:2011 Light and lighting Lighting of work places Part 1 Indoor work places

EN 15193:2007 Energy performance of buildings. Energy requirements for lighting.

With a LED retrofit the installation will be lower than 16W/m2. Is it enough? (EN15193: Energy performance of buildings Energy requirements for lighting)

W/m2, maybe it is time for a stricter limit?

Typical luminous efficacies of lamps and luminaires lm/W

Lamp type Luminous efficacy of

lamps (lm/W) LOR

Luminous efficacy of luminaire (lm/W)

Fluorescent 5 90 70% 63

Fluorescent 8 80 70% 56

LED 160 70% 112

PS 140 70% 98

HPM 60 70% 42

MH 120 70% 84

CFL 60 60% 36

Less energy efficient lamps are banned

COMMISSION REGULATION (EC) No 245/2009 of 18 March 2009* from April 2015 High Intensity Discharge lamps with low luminous efficacy (lm/W) are banned

PM lamps have banned

54,4 60lm/W

HPM lamp

* EC Regulations are mandatory in .U. countries

Can we just replace HPS lamps from 400W to 250W or 150W;

Luminaire HPS 250W Lamp 250W Lamp 150W

288,9W 265,5W 100% 92%

Luminaire HPS 400W Lamp 400W Lamp 250W

429,0W 428,1W 100% 99,8%


Life time;

Photometric results;


Dimming profiles of ballasts and drivers

Doulos T. L. et al. Quantifying energy savings in daylight responsive systems : The role of dimming electronic ballasts, Energy and Buildings 40 (2008) 3650

238 lux

227 lux

214 lux

Light economics

15 luminaires 236W T8

Installed power 1,3kW

Power reduction 56% Reduced maintenance costs

The feasibility study will result in the selection with the fewest luminaires

Scenario , retrofit 1 to 1 15 luminaires 38W LED Installed power 0,57kW

Scenario , retrofit with fewer luminaires 10 luminaires 57W LED Installed power 0,57kW

LED can be dimmed to the proper lighting levels

Target illuminance: 300lx

356 lx, Uo 0,72, 7,32W/m2

, 63,7 lm/W

The same luminaire LED increasing current (and heat sink) can be used

for target illuminance 500lx

Malpractice with LED driver

With proper driver

Max 79,1 oC


Max 151,3 oC

Fast ageing

Using LED luminaire or 8 LED tubes?

What is happening with CE;

LED Luminaires: more expensive but more efficient and according standards

Selecting the proper luminaire

Lighting Output Ratio, luminous efficacy Type of the lamps Optical equipment (Lens, anti glare etc) Placement and volume of luminaire IP protection

The selection of the light distribution

Finally the specifications

Photometric calculations according 12464-1 Energy national rules High LOR, Luminous Efficacy >90lm/W Power Factor >0,9 Color Temperature 3000-4000, CRI not only

Ra8 > 80 but also Ra15 > 80

Replaceable LED modules Heat sink and check with thermophotography

More specifications

Life time with high LLMF factor Declaration of Conformity CE, Photobiological safety, Restriction of the use of

certain Hazardous Substances in electrical and electronic equipment Directive ROHS, ISO

Proper light distribution Photometric files *.ldt *.ies Warranty

The placement of the luminaires isnt lighting design

Relux a free lighting simulation tool

Sensor placement

Emergency lighting according EN 1838

Energy calculations according EN 15193 and

DIN 18599

Interior lighting according EN 12464 -1

Exterior lighting according EN 12464 -2

Road lighting according EN 13201 and Tunnel lighting


Thank you

Lighting Standards

For luminaires For lighting design

Declaration of Conformity from manufacturer CE Electromagnetic compatibility Directive (EMC)

Low Voltage Directive (LVD)

EN 62031 ( LED )

62471 ( LED / )

ISO 9001:2008 ISO 14001:2004

Restriction of the use of certain Hazardous Substances in electrical and electronic equipment Directive (RoHS)

Is ENEC necessary;

Private logo


, however.




EN 55015

9kHz 30MHz AC B

EN 55015

9kHz 30MHz B

EN 55015 30MHz 300MHz B

61000-3-2 AC C

EN 61000-3-3 AC -

EN 61000-4-2 8kV



EN 61000-4-3 RF 3V/m A

EN 61000-4-4 AC 1kV B

EN 61000-4-4 Signal and telecom. 1kV B

EN 61000-4-5 - AC L PE 2kV

Lines 1kV C

EN 61000-4-5 - Signal and telecom. B

EN 61000-4-6 RF AC 3V A

EN 61000-4-6 RF Signal and telecom. 3V A

EN 61000-4-8

3A/m A

EN 61000-4-11 AC 0,5





LED EN 60598-1

EN 60598-2-3

LED EN 60598-1

EN 60598-2-1

LED EN 60598-1

EN 60598-2-2

- (


EN 62493

- (


EN 62493