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12v AC / DC





Colour Temperature (kelvins)

Cool White – 4000K, Warm White – 2700K

Lumen Output

345 Lm

Beam Angle

30 Degrees

Start-up Time



1 Year

Integral 3.7W LED MR11 Bulb, Warm White – 12v AC/DC

Replacing Existing 12v Halogen Bulbs to LEDs

This LED MR11 Bulb and indeed 12v systems require a transformer to convert  220-240v mains supply to a lower 12 volts. Low voltage light bulbs include G4s, MR11s and MR16s (G5.3). LEDs can save households money and energy, mainly due to long lifespan. When replacing halogen bulbs with LED equivalents, there are things to consider. Here is what you need to know…

There are two different types of transformers: magnetic and electronic. Old style magnetic transformers, also known as wire wound, are simple in concept. They use coiled wires around an iron core to convert the output to 12v. All Lumena transformers work in this way. Electronic transformers have more complications. Some older types, prior to LED bulbs, are not compatible with LEDs. The electronics of the old transformers tend to interfere with the LED bulb electronics, causing flashing, flickering or even no light at all. Newer electronic transformers have the intent of powering LEDs and therefore work well, as long as the wattage and current type are also correct.

Some LED bulbs only work with 12v DC power supply. They need a 12v DC transformer or they will not work correctly, if at all. LED bulbs, such as Lumena’s LED G4s, LED MR11 and MR16s will run off 12v AC and 12v DC. This means that either an AC or DC 12v transformer can be used causing no issues at all.

All transformers have a wattage range or ‘size’ which you must think about…

If you are looking to change from halogen bulbs to LED and previously used a transformer with the halogen bulbs, the likelihood is that the transformer will be too large for the system, expecting a higher amount of current to be running through the system. LEDs use up to 90% less power than halogens, therefore a lower wattage transformer should be used as not to underload the transformer. If you underload a transformer, it produces a higher voltage output and can cause the LED bulbs to flicker or fail prematurely.

As with most purchases, it is important that items are maintained correctly after installation. This is especially important for outdoor lighting which can be affected by the outdoor environment, especially in harsher areas such as coastal areas. By not following the aftercare instructions, which are always included with the relevant product, this may void any guarantees or warranties.


Lumena offer a number of Teak bollards and post lights in a range of sizes. Teak wood is a part of the ‘Tectona Grandis’ hardwood species and is highly durable, producing a natural oil which helps protect from outdoor conditions. As Teak is subject to outdoor weather conditions, it starts to age and develop a duller, soft, grey appearance. This elegant, lightweight wood is ideal for both domestic and commercial use and is very easy to maintain.

To add a further protective coating from weather conditions, teak sealer is highly recommended. Lumena always apply at least one coat of Teak sealer prior to dispatch but this should also be applied periodically to help protect and freshen up the path lights.



Contrary to popular belief, Stainless steel needs looking after; especially in exposed and coastal areas. If not cleaning on a regular basis, the acid that is ever present in the air ( and salt in coastal areas) will affect the surface causing pitting and even rust like staining (known as ‘Tea staining’ ) to appear.

To keep your lights looking good, simply wipe clean the outside with a damp cloth and then dry once a month, (more frequently in coastal areas). Specialist stainless steel cleaning products can be used (We recommend and stock ‘Kilrock stainless steel cleaner’) but never use an ABRASIVE cleaner. In extreme conditions we recommend applying 2 coats of Clear lacquer to protect the steel surface. (We recommend and stock ‘Simoniz’ clear lacquer).



Both brass and copper are extremely durable materials, with brass being a combination of copper and zinc, meaning neither can rust or corrode. Over time brass will subtly weather and naturally change to a darker colour which will blend in with the garden surroundings. Copper also naturally changes colour quite dramatically, often resulting in a brown or ‘verdigris’ effect, again to blend in with the outdoor surroundings. This is because copper reacts with atmospheric oxygen. Although some people may prefer a pristine, shiny copper finish, the oxide layer in fact prevents corrosion and simply adds to the character of natural copper creating a traditional, ‘olde worlde’ appearance. If a new copper finish is preferred, a layer of lacquer can prevent / slow down the weathering process.



240v fittings can be affected by damp conditions, typically when located outdoors. When a fitting is located outside in the cold air combined with the heat produced by the lamp inside, it is inevitible that condensation will occur, just as it does on bedroom windows in the home. If too much condensation is produced, this could result in the fitting tripping, especially in these types of fittings where a drainage hole is not possible. To combat this, Lumena include silica gel with all 240v in-ground lights and spike light to soak up any excess moisture – these should not be removed but replaced periodically and fittings checked. If any water is sitting in the fitting, this should be tipped out and the fitting safely dried out. Condensation can be more prominent when the fitting has been opened on a damp day, as the damp air will then be trapped inside when re-sealed. Therefore it is recommended that any maintenance, including changing bulbs, is performed on a dry day. An additional practice put in place by Lumena is to apply Lithium Grease to the bulb holder / bulb which acts as an additional seal to prevent tripping. Although this prevents tripping, the fittings will still need to be checked and dried out should water sit inside the fitting. For extra protection, fitting can also be filled with Wiska Gel (electrical insulation).