Key criteria for selecting an LED solution

Marco Wendling Lietcorp GmbH

Selecting an LED based solution…

Brand Product features

Known brands (selection) Emerging brands (selection)

LIETCORP

A new and sometimes large selection…

Known brands+ Emerging brands

Select by company size or level of awareness is not a guarantee of successIt is above all the feature/requirement/trust ratio which premium

+• Wide range• Lighting expertise• Reliability• International presence

• Flexibility• Business model• Pricing• Dedication

• Focus on niche• Electronic expertise• Creative• Flexible• Dedicated

• Limited portfolio• Capacity• Reliability• Sustainability

! !

Product features

• Technical specs• Quality – Safety - Warranty• Price

Product features: technical specs

• Efficacy (lm/W)• Colour temperature (K)• Colour rendering (CRI)• Binning• Lifetime <-> Thermo-management• Glare

Technical specs to consider

Technical specs: initial vs final efficacyFitting Indutrial MB

T5 fluorescentIndutrial MB

HIDIndutrial MB

HPSIndutrial MB

LED

Power light source 2x80 W 250 W 250 W 100 W

CCT 4000 K 4000 K 2200 K 4000 K

Luminous flux 12300 lm 20000 lm 27000 lm 12220 lm

Efficacy light source 77 lm/W 80 lm/W 108 lm/W 120 lm/W

Power system 160 W 275 W 275 W 110 W

LOR 90% 70% 70% 90%

Rated LLMF at 2,000h 95% 85% 95% 100%

Final lumen output 10500 lm 11900 lm 17900 lm 11000 lm

Total system efficacy 66 lm/W 48 lm/W 65 lm/W 100 lm/W

CRI >80 >90 25 85

LED120

lm/

W

Module110

lm/

W

Luminaireefficacy100

lm/

WLamp HPS120 lm/W

Luminaireefficacy

65 lm/W

Technical specs: initial vs final efficacy

It is always key to compare the final light output of the system.

For LED fittings it is crucial to get the final „hot“ light output and not the initial LED value.

Technical specs: colour rendering index

1 Old pink

2 Mustard yellow

3 Yellow green

4 Light green

5 Turquoise

6 Light blue

7 Purple

8 Lilac

9 Deep red

10 Deep yellow

11 Deep green

12 Deep blue

13 Skin

14 Chlorophyll

Incandescent 100Halogene 100Fluorescence 80-90MH ceramic 80-95HP Hg 45-60HPS 25

Typical CRI values

LED 65 - 95

The higher the CRI the lower the system efficacy

The CRI is reflecting the average value basing on standard reference values

R9 = 27,8R12 = 62,9

R9 = 0 R12 = 95

LED CRI 80 DECHARGE CRI 80

Source : iLED + OSRAM

Technical specs: colour rendering index

The LED binning assures the homogeneity from LED to LED as well as the homogeneity of the complete installation

MacAdam steps (SDCM): Area in which no colour difference is visibleColour differences gets visible above the value of 3

Only a MacAdams Steps value is granting a good homogeneity of an LED based lighting system.

Fine binning exampleNote : a binning indication in +/- Kelvin gives only a limited indication

Source : OSRAM

Technical specs: binning

Light output maintenance / lifetime ratio

LED

Example MH 70WInitial lm ECG : 6600 lmAverage L70 lm ECG : 5250 lm = 80%

Source : ENDO

Technical specs: system lifetime

Example and interpretation of an LED lifetime curveTechnical specs : system lifetime

A good thermal management of the LED systems grants the specified/extrapolated lifetime value.

Temperature control=

Lifetime control

Good thermomanagement· More light output· Longer lifetime

C°

More current· More light output· Shorter lifetime

A

More temperature· Shorter lifetime· Less light output

T°

TemperatureLight output

Lifetime

Technical specs: system lifetime

Source : OSRAM

Current

A topic to consider with attention

• An LED based system can show very attractive technical features

• In the application the result can unfortunately be very disappointing for the users

• LED light sources have a very punctual light emission surface creating very high luminance values

• It is very important to consider this topic when considering an LED lighting system especially when it comes to illuminate work spaces

Technical specs: glare

Product features

• Technical specs• Quality – Safety - Warranty• Price

Product features : Quality, Safety, Warranty

Objectively:• Technical specifications• Precision of documents• Certified light distribution curves• Warranty claim and conditions

Subjectively:• Reliability / experience of provider• Provider profile : manufacturer or distributor

There is no “golden rule”, nevertheless...

Product features

• Technical specs• Quality – Safety - Warranty• Price

Product features: Price

Objectively:• Technical specifications• Performance required• Warranty claim and conditions

Subjectively:• Reliability / experience of provider• Provider profile : manufacturer or distributor

There is no “good price” but always a “right price”...

Thanks for your attention!

Q&A