Key criteria for selecting an LED solution Marco Wendling Lietcorp GmbH

Selecting an LED based solution…

BrandProduct 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 success It 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 efficacy FittingIndutrial MB T5 fluorescent Indutrial MB HID Indutrial MB HPS Indutrial MB LED Power light source2x80 W250 W 100 W CCT4000 K 2200 K 4000 K Luminous flux12300 lm20000 lm27000 lm lm Efficacy light source77 lm/W80 lm/W108 lm/W 120 lm/W Power system160 W275 W 110 W LOR90%70% 90% Rated LLMF at 2,000h95%85%95% 100% Final lumen output10500 lm11900 lm17900 lm lm Total system efficacy66 lm/W48 lm/W65 lm/W 100 lm/W CRI>80>

LED 120 lm/W Module 110 lm/W Luminaire efficacy 100 lm/W Lamp HPS 120 lm/W Luminaire efficacy 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 100 Halogene100 Fluorescence80-90 MH ceramic80-95 HP Hg45-60 HPS25 Typical CRI values LED The higher the CRI the lower the system efficacy The CRI is reflecting the average value basing on standard reference values

R9= 27,8 R12= 62,9 R9= 0 R12= 95 LED CRI 80DECHARGE 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 visible Colour 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 example Note : a binning indication in +/- Kelvin gives only a limited indication Source : OSRAM Technical specs: binning

Light output maintenance / lifetime ratio LED Example MH 70W Initial lm ECG :6600 lm Average L70 lm ECG : 5250 lm = 80% Source : ENDO Technical specs: system lifetime

Example and interpretation of an LED lifetime curve 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° Temperature Light 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”...

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