Lux reports: These LED retrofits are designed as energy saving replacements for the original tungsten halogen filament lamps.  The AR111 filament lamp is usually 12V and, unsurprisingly, 111 mm diameter.

The lamps reviewed here are designed specifically as retrofit. I.e. they have an integral driver in the base. There are some LED AR111 suppliers whose lamp is only supplied suitable for luminaires with a dedicated, remote driver.

The reason for developing a large diameter reflector lamp was to achieve a tightly controlled beam which could be used for display lighting. Having a 12V filament meant you had almost a “point source” in terms of optics.

These LED replacements, therefore, need to have a good quality beam (no hot spots or striations) and excellent colour rendering. All the lamps have a CRI >80. We asked for lamps with a beam between 20° and 40°. Display lighting often requires a very narrow beam and you should check what is available from the manufacturer.

When we refer to a beam angle, we mean the total width at which the intensity is half the peak. E.g. a 40° beam is a cone of 20° around the central axis. Some manufacturers quote the angle either side of the axis. This makes the beam seem to be half the width it actually is.  Labelling regulations say that the packaging should quote the lumen value inside a 90° cone. This is known as ‘useful luminous flux’ and should be marked on the box.

In order to test the colour quality, we sent the lamps to the laboratories at University College London for independent testing and comparison. Thanks go to Peter Raynham, the course director of the MSc in Light and Lighting and Janine Stampfli, the MSc student who conducted the testing.

The LED lamps were compared with a 75W AR111 halogen filament lamp and the CIE CRI and TM-30 Indices.

One final point: you need to check that the retrofit lamp will physically fit inside the luminaire. There have been some cases where the LED version is too large – this is often caused by the size of the heatsink.

Summary

It is interesting to see that the CIE CRI Ra which is based on eight pastel colours gave a good indication of colour rendering compared with the much more detailed and informative IES TM-30 which is based on 99 colours of all shades and saturation.

The Colour Vector Graphic is much more useful because you can easily see the deficiencies and strengths compared with the reference source even though it doesn’t have any numbers attached to it.

One last point that is often forgotten is that the only reason incandescent lamps have a CRI of 100 because they are also used as the reference source. Apart from its familiarity, you wouldn’t really want a light source so deficient at the blue end of the spectrum.

 

 

Crompton

This lamp has a nice looking beam with soft edges. Like another of the lamps reviewed, about 8% of the light falls outside a 90° cone. This means you get a bright centre with extra light for the ambient surroundings.

In appearance, there is an attractive outer rim with cooling “ribs/fins”. This spoilt somewhat by the central frosted plastic moulding where the 12 yellow LED chips can clearly be seen.

• Lux rating:

3 STARS 

 

 

 

LEDVANCE

This Osram lamp from LEDVANCE most probably gives the nicest beam. It is uniform from the centre to the edge with no sharp cut-off.

The aluminium reflector is quite shallow and, like the other lamps, has diamond shape facets. The front of the lamp is completely sealed by a clear plastic lens. This has the advantage that the reflector would stay clean throughout its life.

• Lux rating:

5 STARS 

 

 

Megaman LED Reflector

This has a facetted aluminium reflector with a clear prismed plastic cone in the centre to direct the light.

We tested the 48° version and the centre of the beam is nice and clean. However, the overall beam is very wide with 15% of the lumens being emitted outside 90°.

• Lux rating:

3 STARS 

 

 

 

 

Philips Master LEDspot

This is a nice looking lamp and the front face looks almost exactly like the filament version. The concave reflector looks metallic although it is actually heavily prismed clear plastic. There is also a clear conical prism directly above the light source.

The beam is uniform from centre to the edge and there is only the slightest wooliness to the cut-off.

• Lux rating:5 STARS

 

Soraa Vivid

When I asked one well-known lighting designer which AR111 she specifies, she simply said “Oh, I just go straight to the top and specify Soraa”.

One aspect of Soraa lamps that designers particularly like is the range of snap on lenses. These can be used to adjust the beam width or change the colour temperature, CCT and can be done easily even after installation. If the layout of the shop changes, you can simply use another snap on lens.

• Lux rating:5 STARS

 

 

Verbatim

As mentioned in the introduction, you need to check that the retrofit LED lamp will physically fit the luminaire. Verbatim are proud of their optimised thermal design which means it is shallower in depth than many other lamps.

It is also the most realistic looking lamp. There is no front cover, the reflector is all aluminium and there are no plastic mouldings in the centre. The beam is also good with no unevenness.

• Lux rating:

5 STARS

 

 

Test results

Visit Novel Energy Lighting to buy these brands of LED AR111 at very competitive prices!

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Selling Cars the Megaman Way:

When Greers of Antrim wanted lighting that would not only show the cars off to the best effect but also provide massive energy savings, they decided on various Megaman lamps for the refurbishment. Greers, a family business and the only independent authorised Volvo Dealership in Northern Ireland, needed more space and decided to merge two buildings together to make one big showroom. Megaman’s technical team worked out the best way to achieve perfect illumination on the cars, achieving the maximum financial and energy savings, whilst reducing future maintenance. T & E Howie carried out the installation.

 

Megaman’s Carlo was specified for the main showroom over the cars utilising a 39W Tecoh RDx LED module in the fitting. Carlo is a range of recessed adjustable scoop LED downlights that offer excellent lighting performance and can be used to replace metal halide fittings. Adjustable up to 45° tilting angle and 355° rotation angle, the Carlo is an

ultra-flexible energy saving solution for use in retail applications where the merchandise has to catch the eye. 

 

 

Megaman’s 15W AR111’s were chosen for the wooden ceiling in the ‘customer welcome area’ to provide a relaxed and welcoming atmosphere. The 2800K colour temperature of the AR111’s produces a comfortable warm, white light and the narrow beam angle make it perfect for installation in display and furniture applications. UV resistant and corrosion-proof Dino LED battens have been used in the service and inspection bays to provide a high performance illumination. The IP66 rating ensures protection against water and dust ingress and a tough polycarbonate body with a prismatic diffuser.

 

 

The Siena integrated LED downlighters have been incorporated in toilets and small store rooms. Compact in size and with no external driver, these downlighters are easy to install and maintain whilst delivering high efficiency and lumen output. Ultra slim 50W Berto panels have also been installed in the offices to provide an integrated lighting solution that facilitates easy installation and maintenance. It delivers a high luminous efficacy up to 109lm/W – matching the lighting levels of 3 x 18W T8 and 3 x 24W HE T5 fluorescent modular fittings.

 

The lighting refurbishment has resulted in a saving of £2569 pa when compared to traditional lamps and, perhaps more importantly, reduced energy consumption by 18,291kw a year and 9950kgs of CO2. Paul Howie, from the installers T & E Howie, commented “We are delighted to have been nominated to do the work for Greers and are very pleased with the finished work on the project. I hope that it helps Greers to continue their success in selling cars whilst keeping lighting bills to a minimum”

 

Visit www.novelenergylighting.com to explore Megaman LED options for your retrofit project. Call us today to discuss pricing and availability: 0208-540-8287, or email: sales@novelenergylighting.com

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