Key criteria for selecting an LED solution Marco Wendling Lietcorp GmbH.
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Transcript of Key criteria for selecting an LED solution Marco Wendling Lietcorp GmbH.
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
• 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
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 : 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: 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”...