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This commodity was arise in the October 2012 affair of LEDs Magazine.

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Appearance the Table of Contents and download the PDF book of the complete October 2012 issue, or appearance the E-zine adaptation in your browser.

Refrigerated affectation lighting (RDL) represents one of the added absolute applications for LEDs. Because beaming tubes can be replaced with LED strips and abate activity acceptance by 60%, retailers are alpha to apparatus LED case lighting on a added scale. Typically, a abundance can apprehend return-on-investment (ROI) afterwards 2-3 years application LED-lit coolers. In addition, back LED accessories accord off little calefaction about to a beaming tube, an added activity breach is accomplished on compressor cooling. “LEDs adulation the cold; the colder they are the best they last. We are able to architecture accessories that are rated for 100,000 hours,” said Jamie Pearson, chief bulk beck administrator of Lithonia Lighting, allotment of Acuity Brands.

This merchandizing aftereffect of LED lighting is actuality activated above the air-conditioned cases themselves. Abounding grocery stores, specialty shops and accessibility marts accept absitively to apparatus LED lighting throughout the abundance and in alfresco parking lots and gas stations. For instance, Jerónimo Martins Group (Fig. 1 and 2) afresh installed LED lighting central and alfresco its supermarkets in Portugal, which we will awning in added detail below. Notably, Walmart has set a ambition to use 100% LED lighting in all of its 5366 aliment through new architecture and retrofitting.

As will be discussed, the acceptance ante of RDL alter amid Europe, Arctic America and Asia. The fastest acceptance has been apparent in Arctic America, area incentives accept beneath the time to ROI.

Refrigerated case lighting options

Air-conditioned affectation cases are accessible in abounding styles and sizes, but the bazaar all-embracing about comes bottomward to vertical freezer cases with doors and accumbent air-conditioned cases afterwards doors. The lighting in the vertical cases run angular forth anniversary ancillary of the door, and is about 5-ft tall. In accumbent cases, about there are one or two 4-ft accessories that run at the top of the case (canopy lighting) and the abject of the case (shelf lighting). In Europe, addition accepted architecture employs a row of vertical coolers on top and accumbent coolers on the bottom.

In a abstraction from 2010, Osram Sylvania estimated that there were almost 10 actor vertical case freezer doors accessible for retrofit, and about 20 actor accumbent beeline 4-ft accessories in accessible air-conditioned cases accessible for retrofit in the US. The abstraction estimated there were 14 actor single-lamp accessories and 6 actor dual-lamp accessories in accumbent cases accessible for retrofit, according to Cheryl Ford, vertical business administrator for Osram Sylvania.

The vertical units are acclimated for packaged foods, while the accumbent cases are acclimated for beginning dairy and meats. Though an admission aegis (IP) appraisement is not accepted for the freezer lighting fixtures, abounding users specify an IP appraisement of IP64 or IP65 for the accumbent cases to ensure the accessories can bear wet cleaning.

At aboriginal glance, it would arise that aliment and acknowledgment retailers accept endless options back it comes to allotment a provider of LED air-conditioned affectation lighting. Providers accommodate acclaimed companies such as Acuity Brands, GE Lighting, Nualight, Osram Sylvania, and Philips Lighting, but there are abundant added providers from Europe, Arctic America and Asia. The able artefact account of the DesignLights Consortium (DLC), which includes both vertical and accumbent RDL, contains articles from 19 manufacturers.

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A 5-ft beaming tube uses 60W of ability (total wattage for 58W lamp and ballast). Today’s 5-ft LED accessories about use 12W (right or larboard end unit) or 18-24W (center unit). Both bi-pin and bracket-based versions are offered (Fig. 4). A disciplinarian is bare to footfall bottomward from mains ability to 24V. It is archetypal that one disciplinarian is appropriate per aperture (2 fixtures).

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Some LED accessories use a alternation of low-wattage LEDs, about 0.5W or 1W, forth a strip, while others use activating LEDs spaced forth a metal fixture. Best units accept distinctively advised optics. Some companies action ample artefact curve in a ambit of sizes and blush temperatures, while added companies ambition alone the best accepted case sizes and artefact depths.

Retailers about accept LED accessories with acknowledgment blush temperatures for freezers admitting a warmer CCT of 3000K is added acceptable for meats, angle and seafood. Articles with a blush apprehension base (CRI) of 70 to as aerial as 95 are commercially available, which compares to a CRI of 85 for beaming lamps. For instance, Philips offers its Affinium LED modules (Fig. 5) in blush temperatures of air-conditioned white (5600K) or aloof white (4100K).

Susan Fowler, LED air-conditioned lighting artefact baton for GE Lighting abbreviated the architecture of the Immersion RV40 LED accessories (Fig. 6), as articles that “optimize activity accumulation while accouterment 750-1100 lx, ambuscade the appearance of the ablaze source, absorption ablaze on the packaging against spilling assimilate the attic or doors, and creating compatible ablaze in the case.” GE offers these accessories in 3500K, 4000K and 5000K blush temperatures and sizes of 30, 36, 48, 60 and 70 in. The 60-in, 4000K archetypal produces 1070 lm (213 lm/ft) and requires 18W of power.

Regional differences

Retailers in Arctic America, Europe and Asia are at altered stages of RDL adoption. The types of cases and sizes alter by arena as well. Fowler acclaimed that Arctic American aliment tend to be above in accepted than aliment in Europe. She declared that while all regions are absorbed in abbreviation activity bulk and aliment bulk with LED fixtures, western countries tend to focus on activity and ablaze quality, while eastern regions tend to focus added on payback.

In Arctic America, the account rebates accept accelerated adoption. “North America is afar advanced of Europe,” said Kelly. “Perhaps 40% of the Arctic American bazaar has been retrofit in the freezer segment,” he added. Kelly predicted that LED lighting for all air-conditioned cases will become the de facto accepted in Arctic America by 2014.

Addition aberration is that artefact tends to be anchored afterpiece to the aperture in cases in the US. Some companies action a artefact band that accommodates these differences. Speaking to Osram’s approach, Ford said, “The ambit of the lighting accoutrement to the commodity is key. If your shelf abyss is up to 4 in – one artefact is used, 4-8 in – a additional artefact and 8-10 in – a third product.”

Refrigerated cases accept been lit by T8 beaming tubes for several decades. GE Lighting was the aboriginal aggregation to install LED lighting in air-conditioned cases at Walmart in 2006. At that time, the LED accessories acclimated 41W of ability each, replacing 59W beaming tubes. “Because LED air-conditioned affectation lighting was one of the aboriginal LED categories created for grocers, the technology has had time to beforehand and drive the aftereffect bottomward significantly,” said Fowler.

Such aboriginal installations are aloof now casual their assurance aeon of bristles years or 50,000 hours of operation. Fowler declared that testing of these systems has apparent they currently accomplish at or bigger than the predicted ethics afterwards bristles years. However, abounding barter are opting to advancement to the newest LED accessories because of the college efficiency. For instance, accepted bearing GE accessories crave 45% beneath ability than the accessories produced in 2008.

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In 2006, the Lighting Research Centermost at Rensselaer Polytechnic Institute conducted a abstraction comparing LED and beaming lighting in air-conditioned cases. The abstraction bent that shoppers overwhelmingly adopted the LED-lit cases for announcement packaged foods of abounding altered colors. The shoppers activate the LED lighting fabricated the commodity added appealing, added adequate to attending at and added eye catching.

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Recent case studies

Three contempo installations of air-conditioned case lighting took abode in grocers in altered genitalia of the world: the Jeronimo Martins Group in Portugal, Sainsbury in the UK and Aliment City in the US.

The Jerónimo Martins Group was amid the aboriginal European retail companies to accouter its new aliment absolutely with LED lighting, including the alfresco parking lots and gas stations. The aboriginal accession took abode in 2011 in its Recheio abundance in Torres Vedras, a arena arctic of Lisbon. For its air-conditioned shelf lighting, Arquishelf luminaires were advised with 56 Oslon SSL LEDs from Osram Opto Semiconductors. Activity accumulation was estimated at 50% for the Recheio facility. The all-LED lighting ability will be acclimated as a archetypal for the chain’s added stores. The additional accession is appointed to booty abode in a abundance in Tavira, Portugal.

Sainsbury, a bazaar alternation in the UK afresh called Nualight to accumulation air-conditioned case lighting for all its new and retrofit abundance projects. Nualight declared that its LED lighting will abate lighting-related activity burning for Sainsbury’s by 70% in low-temperature cases and by 40% in medium-temperature cases. Sainsbury was the aboriginal banker to use Nualight’s Perfino fixture, which is advised to abode the challenges of cogitating packaging and afterimage of the LEDs in multi-deck cases.

ROI and activity savings

As apparent with these case studies, the activity accumulation for LED lighting in air-conditioned cases about averages 60% and can be 70% or greater back ascendancy sensors are used. In the US, the upfront bulk of LED lighting retrofits can be account by federal tax accumulation and bounded account rebates.

Beneath the Activity Policy Act (EPAct) Section 179D, bartering acreage owners who accomplish condoning energy-reducing investments in new or absolute locations can access tax deductions of up to $1.80/ft2. The accepted law is able for projects completed by December 31, 2013.

Local account rebates for air-conditioned case lighting alter by accompaniment (see ). One prerequisite for accessing these rebates is that the artefact called is listed in the able artefact account of the DesignLights Consortium.

Lithonia’s Pearson sees boundless absorption in ascendancy analysis and dimming, abnormally amid aliment that accomplish 24/7. GE’s Fowler commented that the barter best absorbed in the technology are those that pay the best for electricity. “Retailers who absolutely watch their ability acceptance will accept ascendancy analysis to added abate costs. However, we additionally see that some retailers accept apropos about the appulse of concealment on cast image,” she said.

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As retailers accepted appraise and gradually accept ascendancy sensing, the technology in the sensors continues to advance. Admitting beforehand sensors led to brusque changes in lighting levels, the newer sensors and programming in LED accessories allows added bit-by-bit changes in ablaze level. “We accept what we alarm follow-me dimming, area ablaze levels are additional as a being approaches and walks accomplished the affectation case,” said Ford. Back no being is detected for some aeon of time, concealment the ablaze levels by 50% will decidedly abate activity cost.

Lifetime, aliment and reliability

Aliment accumulation and cooling accumulation additionally accord to ROI. The beaming tubes in a freezer ambiance about aftermost alone 6-12 months and the aberration in calefaction generated amid LED accessories and beaming tubes can bulk to 100 BTU per door. Best of the LED accessories are rated for 50,000 hours or bristles years. Aliment costs will alter by the admeasurement of the installation, but as we discussed with the Aliment City example, aliment bulk can be significant.

“I anticipate the above abstruse claiming is not associated with the LED accessories themselves but the affluence of accession – it has to do with the architecture of the peripherals, the cabling, the LED driver, the robustness of brackets/clips you use,” said Kelly. “By accepting the adaptability in your accoutrement architecture to clothing any case autogenous profile, you can acclimatize the lighting afore and afterwards accession to actualize the optimal impact. That’s acceptable accretion important,” he said.

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To ensure reliability, best manufacturers are actual baddest about the LEDs they use, or they use centralized LEDs. The LEDs are absolutely activated for believability beneath IES LM-79, again the accessories are believability activated beneath IES LM-80.

Next accomplish for aliment retailers

The retrofit of beaming tubes to LED lighting in air-conditioned cases is carrying an activity accumulation of 60%. The abutting bearing coolers accept been advised with chip LED lighting, and as ascendancy sensors advance it is acceptable that concealment will be acclimated to added abate activity use.

Increasingly, retailers are attractive to differentiate their aliment and spotlight specific foods or products. While the acceptance of LED lighting in air-conditioned cases was apprenticed by activity accumulation and incentives, the acceptance of LED lighting throughout the aliment is added apprenticed by the affairs aftereffect of LED lighting.

The brighter LEDs accessible today are accretion the affairs that ambient LED lighting can be acclimated to accompany out colors and textures of aftermath and specialty items. For example, the Zest emphasis luminaire from Nualight (Fig. 8) has been accurately advised for aliment retail environments and appearance a CRI >90. The blush temperature may be acquainted via alien ascendancy from 2700K to 5000K to clothing the affectation commodity acceptance the banker the adaptability of re-configuring affectation layouts afterwards defective to change the ablaze fixture. The 8-ft archetypal produces 1600 lm at 30W power.

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