Advantages of LED technology as opposed to fluorescent lamps

Besides the colour temperature, the long intervals between maintenance and the extremely compact construction represent significant advantages of LED technology. Thanks to lens optics and dimples, light can be optimally directed onto the working surface where it is needed, whereby the light output of the LED can be used much more efficiently. LED luminaires are also extremely resistant to knocks and vibration.

Advantages of LED technology as opposed to halogen low-voltage

A major advantage over halogen low-voltage lamps is the fact that the light contains no IR/UV rays and that there is therefore no heat radiation. The energy efficiency of LEDs is well over twice as high as that of halogen low-voltage technology.

Binning and light quality

A variety of features can be taken to rate the quality of a LED luminaire. The most important, however, is the uniformity of the light colour. Due to the process employed, a wide variety of light colours are produced during the manufacture of LEDs; these are then sorted in a downstream process and mounted on printed circuit boards. This complicated sorting process based on various characteristics – e.g. light colours – is known as binning.

The extremely high initial quality of the LEDs used by Nimbus plus our LED technology combine to form the basis for unrivalled uniformity of light colour in all Nimbus LED luminaires. We place the same high demands on the light quality of our LEDs as we do on the design of our luminaires and the materials we use. The experience we have gained from over 8000 projects equipping both homes and nonresidential buildings and from over 20 million LEDs we have installed has led to a binning quality at Nimbus which is unsurpassed by any other company on the market.

Nimbus information on spectral radiation

Changing the luminous flux with newer LED generations

How does the luminous flux change in LED products from one LED generation to the next and what does this mean for the published lighting measurements and parameters? Unlike all other lighting media, LEDs are in a constant optimization process, comparable to that in the microchip industry. Their performance and efficiency is getting better all the time thanks to constant development. We pass these advantages on to our customers by always installing the latest generation of LEDs in our luminaires. The typical measured values of our LED luminaires can therefore change. These modifications are performed without advance notification. Up-to-date data records are always available for download on our homepage at to assist you in your planning.

Colour rendering (CRI)

All of the LEDs used by Nimbus have a colour rendering index (CRI) > 80 and meet the applicable guidelines for office lighting in this regard. In our retail luminaires, we use LEDs with an excellent colour rendering index CRI > 90 for a homely lighting experience; LEDs with a CRI > 80 are installed in the project luminaires in order to achieve the greatest possible light output.

Colour temperature/light colour

Nimbus uses high-quality, warm-white LEDs with a colour temperature of 2700 K, 3000 K or 4000 K.

Connecting LED luminaires to EIB/KNX bus systems

Connecting LED luminaires to EIB/KNX and other bus systems poses no problem at all. Please see the technical notes in this catalogue for important information on integrating LED luminaires into EIB/KNX/DALI and bus systems.

Control and dim-ability of LEDs

Light emitting diodes are semiconductor components which can be dimmed (PWM) or dynamically activated in a most efficient fashion. Please see the technical notes in this catalogue for important information on the correct activation and dimming of LED luminaires.


A LED luminaire can be disposed of in the same way as a conventional lamp. The PCB is treated as electronic waste for disposal purposes. 99 % of the PCB is aluminium and can be recycled. Unlike low-energy lamps, a LED contains no mercury and is therefore not treated as special waste.

Distance between converter and luminaire

The converter can be installed some distance away from the luminaire. However, the cable cross-section must of such a size that at least 23 V reach the luminaire.

Efficiency and performance

In comparison to many conventional lamps our LED luminaires have a much higher level of efficiency. On the one hand, this is the result of the LED being 5–6 times more efficient than a light bulb, and on the other hand, it is due to the fact that the light from a LED does not have to be directed out of the luminaire via reflectors, and so the light output of a 8 watt LED luminaire is roughly equivalent to that of 100 watt light bulb or a of a 50 watt halogen lamp.

Emergency operation

All Nimbus LED luminaires can be operated (if a suitable converter is used) with direct current in emergency power systems with central battery back-up according to VDE 0108/VDE 0100/Part 718.

Eye damage

The use of LED luminaires for lighting raises no concerns as far as damage to eyes is concerned. Unlike many of its competitors, Nimbus mainly uses low power LEDs. These Nimbus LEDs fall into the safest category, LED Class 1, and since the middle of 2008 have been categorised as a light source belonging to the classical lighting media. However, because of the high luminance (and as with other, conventional light sources) one should not look directly into a LED for a longer period of time.

Gentle light

LEDs do not emit UV/IR light in their beams and therefore no heat is given off from the luminaire surface. They are therefore highly suitable for lighting in situations where objects need to be preserved, e.g. in museums or galleries.

Handling LED luminaires

Thanks to the way in which they are constructed, LED luminaires are protected against vibration. However, the components in the LED modules may not be subjected to mechanical stress and the circuitboard conductors may not be damaged.

Heat development of a LED luminaire

The temperature on the back of a LED luminaire is no higher than 70 °C. However, care must always be taken with LED modules to ensure correct polarity (+/-) of the connections. Modules which have been wrongly connected heat up and can be destroyed as a result.

Illustrations / drawings / dimensions

Illustrations and scale drawings of all Nimbus products can be downloaded from

LED afterglow

LED luminaires can continue to glow a short time after being separated from the power supply. This has no effect on the quality and lifetime of the luminaire.

LED Engineered Design

The Nimbus LED luminaires are the result of integral product development; all technical and formal design aspects are funnelled into the development. Clear design and minimised use of style elements unite lighting technology, optics, intelligent electronics and thermal management at the highest possible level. The LED, a highly efficient and durable “lamp”, forms the trendsetting basis. Optimized thermal management maximises the fixture efficiency, and the high precision alignment of the dimples is the key to glare-free and efficient lighting. The LED-bearing PCBs are specified in a complex development process and manufactured by our technology partners exclusively for our products. Consideration of the future deployment of the LED luminaire and of the lighting job to be done are major factors influencing the development process.

LED failure

What happens if, against all expectations, a LED in a luminaire is defective? Does the whole luminaire need to be replaced? In the unlikely case of a failure of individual LEDs or of a whole luminaire, all Nimbus LED products can be repaired/serviced by Nimbus or by an authorised specialist dealer / support centre partner. You have a statutory right to the repair of all defects in connection with any faults occurring during the statutory guarantee period under EU law. Even after the guarantee period has expired, repairs are of course still possible. This involves replacing PCBs or individual LEDs on your premises our in the workshop. During the repair process, the replacement components are adjusted as far as possible to achieve the right light colour and brightness.

LED failure rate

Our experience, which covers the use of several million LEDs, has shown that a total failure is very unlikely. The statistical failure rate is 2 LEDs per million installed.

LED light in general lighting

LED luminaires are being used more and more for general lighting. The high-quality warm-white LED light developed by Nimbus was designed to be used for general lighting. Nimbus LED luminaires are perfectly suited for use in the professional area (offices and workplaces) where people should be able to work without tiring, as well as for the home with a light similar to that of a halogen lamp. At the beginning of 2009, Nimbus lit an office building for the first time entirely with LED luminaires – over 2500 of them. Thanks to their energy efficiency, LED luminaires revolutionised the lighting market and their impact will be a lasting one.

LED luminaires in damp atmospheres

The luminaire‘s degree of protection also needs to be considered during planning when dealing with LED luminaires. The luminaires of the Modul Q and Modul R Aqua-series, for example, with degree of protection IP44, are suitable for use in damp atmospheres.

Please not the directions of use for our Aqua luminaires.

LEDs and the lifetime

The useful lifetime of a LED strongly depends on the ambient temperature to which it is exposed, with temperatures on the cool side being beneficial to the length of its lifetime. Steps should be taken to ensure adequate air circulation around external converters.

Lifetime of LEDs

The useful lifetime of LED luminaires is very long and can reach up to 50,000 hours. Even then, a LED does not fail like other lamps, it merely loses light output over a period of time during which there is little change in the subjectively perceived brightness. The failure rate is therefore much lower than for compact fluorescent lamps. The installation conditions contained in the mounting instructions should be observed if the installed components are to achieve their rated useful lifetime.

Light planning/light calculation

You can receive assistance with light planning and light calculation from Please note that this planning service can only be offered to architects, planners and our specialist trading partners. If you are a private customer and require light planning or expert advice, we recommend that you contact a Nimbus trading partner.

Load on the converter

The load placed on a LED luminaire converter may always be lower than the rated wattage, but the rated wattage may never be exceeded. That is to say, you can place a 10 W load on a 60 W converter.

Mounting and installation situations

LED luminaires can be mounted on practically any material (including wood), as the temperature is no higher than 70° C. Please see the mounting instructions for the installation situation for the individual LED luminaires.

Please not the installation situation for a Modul Q 36

Mounting instructions

Illustrated mounting and installation instructions in PDF format can be downloaded either for the specific product or as a bulk download at

Photometric data files

Photometric data files can be downloaded in ldt format from

Sustainability: Low energy consumption and CO² reduction

In view of the discussion on CO², energy efficiency is set to grow in importance. According to the German Electrical and Electronics Manufacturers‘ Association (ZVEI), 3.2 billion kWh of energy and 1.9 million tonnes of CO² could be saved every year in Germany on office lighting alone. One measure aimed at supporting such saving efforts is the EuP Directive 2005/32/EC (Eco-Design Requirements for Energy Using Products) which came into force in September 2009: Among other things, the directive envisages ninefficient products, e.g. for home and office lighting, being successively taken from the market. In comparison, using Nimbus LED luminaires can save up to 70 % in energy costs. Although the purchase price of a Nimbus LED luminaire may currently be around 20–30 % higher than that of a comparable conventional Nimbus luminaire, the higher purchase price will have paid for itself within just a short time, thanks to the significantly lower operating and maintenance costs. Nimbus LED luminaires are also outstanding in terms of their fixture efficiency and their long, fully maintenance-free lifetime. The luminous flux per watt of the current LED is much higher than that of halogen low-voltage light and at 3000 kelvin colour temperature is currently between 80–90 lm/W. Replacing light bulbs and halogen lights with LED technology represents an important contribution to sustainability.

Switching on and off frequently

You can switch a LED luminaire on and off as often as you wish. Switching a LED luminaire on and off frequently will not damage it.

Tender texts

Tender texts for Nimbus luminaires can be downloaded either specifically for the desired product or as a bulk download at You can also contact our project department

Voltage supply of LED luminaires

Nimbus LED luminaires are designed for 24V direct voltage (DC). The LED PCBs have no special protection against short-circuits/overload and excessive temperature. It is therefore important with all LED modules to pay particular attention to the correct polarity (+/-) of the connections. Modules which are wrongly connected heat up and can be damaged as a result.

White LED light

A blue-emitting LED is used for generating white light. This generates a white spectrum with the help of a fluorescent material (phosphorous) – like with a fluorescent lamp. Nimbus uses high-quality, warmwhite LEDs with colour temperatures of 2700 K, 3000 K and 4000 K. LED lamps give off full light immediately after being switched on.