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Sustainable external lighting

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Energy-efficient LEDs are still developing and checking warranties is vital, writes Sandy Patience

A recent exchange in my local newspaper over the pros and cons of illuminating the Beverley Minster at night is a microcosm of a wider national debate. In the ‘yes’ corner are those who think we should make the most of our dramatic buildings 24/7; while opposite, in the shadows, the ‘nos’ get more philosophical: ‘the dark should be dark,’ and practical, ‘it’s an expensive waste of energy’.

Thankfully, expensive energy isn’t what it was 20 years ago. Then, if you wanted to illuminate a building, you would sink dustbin-sized fittings around it and point the 250W light sources up at the walls. This changed with the miniaturisation of the metal halide lamp down to 70W. Smaller lamps meant that smaller fixtures could be attached directly to the buildings. In creative hands this led to impressive results, but in large part it contributed to the pointless vertical light-washing of acres of unremarkable brickwork.

And then came the LED. Ironically, in the beginning its main limitation, low power, sent lighting design off in an innovative direction. Without the capacity to throw light like a conventional spotlight, designers started to weave the tiny light sources into the fabric of the building to follow its shapes and contours - an approach which continues to evolve today. In most part though, modern, more powerful LEDs have become the energy-efficient alternative to metal halide.

So seamlessly is this substitution progressing that LEDs are sold in almost identical housings nobody need know that a technological revolution has taken place. LEDs are still relatively new and knowledge of their application continues to develop through pushing the boundaries of conventional illumination.

The range of fittings available is huge - so it is important to carefully match the technology with the job, using quality hardware with a known provenance. There continues, too, to be some concern with long-term performance. Warranties are important in this respect and you should carefully examine the manufacturer’s claims.


Bega LED light

Bega LED light

The 3540 indicates danger points and provides orientation lighting. It has an optical system that can be adjusted in four steps according to the mounting height and width of the surface to be illuminated. The IP64-rated luminare is available in graphite or silver as standard.

Model 3540
Type Wall luminaire
Luminaire output at 3,000K 320 lumens
Source LED
Colour rendering at 3,000K >80 CRI
Colour temperature 3,000, 4,000 and 5,000K
Luminaire efficacy 53.33 lumens/W
Lifetime 20-30 years
Warranty period 5 years
Dimensions 75 x 130 x 80mm
Country of manufacture Germany
UK distributor Zumtobel
Start of UK distribution 2000

Crescent Lighting

CLM Linear System

CLM Linear System

The CLM line voltage wall grazing system provides superb single-colour light ‘grazed’ over horizontal or vertical surfaces such as building facades, bridges, landscape features and walls. Using its loop-in, loop-out facility, the system is inter-connectable up to a total length of 40 metres from one supply point.

Model CLM
Type Line voltage wall grazing system
Luminaire output at 4,000K 768 lumens, 1,200mm module
Source Seoul Acriche A4 1.2WAC
Colour temperature 4,000K
Luminaire efficacy 50 lumens/W
Lifetime 50,000 hours
Warranty period 1 year
Dimensions 43 x 65 x 400mm / 1,200mm
Country of manufacture UK
Start of UK distribution 2011



Linealuce LED

Linealuce can be hidden behind cornices and stringcourses, radiating a soft and uniform light. The system finds ideal application on the outside of buildings, or in churches and other high-vaulted interiors, as it adapts easily to any given architectural geometries. Fittings can be ceiling or wall-mounted, suspended or recessed.

Model Linealuce LED
Type Linear wall washer
Luminaire output at 3,000K 2,163 lumens, 1,238mm module
Source Cree LED
Colour rendering at 3,000K >80 CRI
Colour temperature 3,100K and 4,200K options
Luminaire efficacy 53 lumens/W
Lifetime 50,000 hours L80
Warranty period 5 years if registered
Dimensions 101 x 117 x 376mm / 638mm / 942mm / 1,238mm
Country of manufacture Italy
Start of UK distribution 2007



Instalight 1050

The spot is designed to provide homogenous illumination of surfaces and accentuation of architectural elements, indoors and outdoors. It features high luminous efficiency due to the high-current LED luminaire. The fitting is available either in RGB with internal colour mixture, or in monochrome warm white or neutral white.

Model Instalight 1050
Type Spot
Luminaire output at 3,000K 2570 lumens
Source LED
Colour rendering at 3,000K 85 CRI
Colour temperature 3,100K
Lifetime In excess of 50,000 hours
Warranty period 2 years
Dimensions 1,215 x 112 x 194 mm
Country of manufacture Germany
Start of UK distribution 2010


Paviom Elencho

Paviom Elencho

The Elencho Micro is a high-performance spot. The round profile, symmetrical projector is formed from die-cast aluminium and finished in powder-coated light grey, black or bronze. The spot is suitable for both indoor and outdoor applications and can be floor or wall-mounted.

Model Elencho Micro EL101
Type Spot
Luminaire output at 3,000K 60 lumens
Source Cree LED
Colour rendering at 3,000K 80 CRI
Colour temperature 3,000K
Luminaire efficacy 60 lumens/W (driver dependent)
Lifetime 25,000 hours
Warrantyperiod 1 year
Country of manufacture China
Start of UK distribution 2009





An outdoor lantern that illuminates without any apparent source of light, the Puzzle combines a matt black frame and clear glass shade with LEDs hidden in the roof of the lantern providing the lighting. IP44-rated, it is equally suited to large interior spaces.

Model Puzzle
Type Outdoor wall light
Luminaire output at 3,000K 220 lumens
Source 3W LED
Colour temperature 3,000K
Lifetime 30,000 hours
Warranty period 5 years
Dimensions 320 x 160 x 140mm
Country of manufacture China
Start of UK distribution 2011



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