FAQ

Technology

What are the advantages of LED lighting?

– Insensitive to vibrations
– No pollutants contained
– Low heat emission
– Lower air conditioning costs
– High efficiency
– Long service life
– Low operating costs
– No switch-on delay
– No flickering

What are the disadvantages of LED lighting?

The purchase price is higher. Due to the lower operating costs, however, the investment costs are amortized within 1–3 years, so that several hundred francs can be saved per illuminant.

The grey energy due to the production process is higher. However, due to the better efficiency and long service life, the total energy consumption is several times lower.

What is the advantage of sensor-controlled lighting?

To calculate the energy costs, the operating time is multiplied by the power. In order to keep the result of this multiplication as low as possible, researchers have been trying for decades to reduce the output while maintaining the same light yield. However, the time component in the formula is underestimated. It contributes just as much to the product of the multiplication. If a fluorescent tube is replaced by an autonomous LED tube, a 50% reduction in power is achieved and usually at least as much in operating time. In addition, there is no need to install slow motion detectors. Together, these technologies are an unbeatable economic and ecological means of reducing operating costs.

What is the disadvantage of sensor-controlled lighting?

The investment costs are higher than for conventional LED lighting. To ensure that the investment costs pay for themselves as quickly as possible, it requires long daily operating times. Calculated over its service life, the illuminant saves the same amount of energy even with low operating times, as it can be used for longer, but this also extends the payback period. As a rule, four times more costs can be saved over the entire life of an LEDCity Tube than are invested.

How safe are the sensor-controlled light sources?

All LED tubes supplied by LEDCity comply with the EN 62776 standard, with the Swiss Federal Inspectorate for Heavy Current Installations ESTI serving as our guideline. This ensures that no electric shocks can occur at any time.

Do these lights require additional devices?

In order that you do not have to do any complex work at the end of the tube’s life, all electronics are integrated in the tube. The lamps can be connected directly to the mains with 100–240 volts and are easily replaceable.

What color temperatures do LED lamps emit?

You can choose between different color temperatures. The spectrum ranges from warm to blue, modern colour temperatures. The neutral colour temperature 4000K is the most common colour temperature on the market. The code 840 is used for this on the lamp. This code describes a colour rendering of > 80% (8) and a colour temperature of 4000 K (40).

How can I dim the LED lamps?

Dimming is controlled autonomously by the LED lamps. You can choose the dimming value that is applied as soon as the LED lamps no longer detect any movement. Of course, you can also set the dimming value to 0% so that the luminaire switches off completely as soon as it no longer detects any movement.

For what kind of buildings are the LEDCity light sources preferred?

The LEDCity light sources are ideal wherever long operating times but short effective usage times are available. We recommend our LED tubes for large-area objects such as multi-storey car parks, warehouses, production halls, corridors, open-plan offices, school buildings, sanitary facilities, street lamps, cold storage rooms, computer centres, hospitals, underpasses and staircases. The objects mentioned are only some of our recommendations. You can of course use our LED tubes for other purposes as well.

Are LED lights harmful to the eye?

The harmfulness of light can generally be divided into three categories:

Ultraviolet radiation (better known as UV radiation)

This can cause severe damage to the eye and skin. Commercially available LED lamps usually emit very little ultraviolet radiation and are therefore harmless.

Blue light

Blue light can be particularly dangerous for the retina in the eye. The reason for this is that blue light can be responsible for the faster death of the individual photoreceptors on the retina and thus worsen the eye’s vision.

As a study conducted by the Swiss Confederation has shown, most LED lamps on the market can be classified as harmless. A distinction is made between four groups:

– Free group: Despite a long irradiation period, there are no risks for the retina.

– Risk group 1: There is a low risk from an irradiation duration of 100 seconds.

– Risk group 2: There is a medium risk from an irradiation duration of 0.25 seconds.

– Risk group 3: There is a high risk even with a very short irradiation duration.

The LEDCity tubes are assigned to the “free group”.

Flicker

The human eye sees light fluctuations up to a frequency of 60 Hertz. However, the retina in the eye detects light fluctuations of up to 200 Hertz. This flickering can cause health problems such as headache or eye pain. Fluorescent tubes sometimes flicker at 100 hertz. It is therefore worthwhile to replace them with high-quality LED lamps for health reasons. LED tubes from LEDCity flicker at a frequency of 2300 Hertz. The retina does not perceive this flicker, so that no health damage is to be feared.

How are fluorescent tubes colloquially called and how do they work?

Fluorescent tubes fall into the category of illuminants and are also known as fluorescent tubes, neon tubes or light tubes.

These illuminants have two electrodes at both ends. There is a gas inside the tube itself. When electricity arrives at the ends, the electrodes heat the gas, which then emits black light/UV light. The fluorescent material (hence the name fluorescent tube) inside the tube glows when it is exposed to UV light. We perceive the now radiating fluorescent material as light.

Compared to the tubes explained above, LED tubes do not contain gas, but light emitting diodes that produce the light.

Are luminaire and illuminant the same?

No. Luminaires contain a light source. In other words, a luminaire is not only the light source, but also the housing in which the light source is located. Nowadays, unfortunately, more and more luminaires are being sold in which the light source is no longer replaceable. With all LEDCity solutions, however, the light source remains replaceable for a better ecological balance.

To ensure that the light sources can also be used in new building projects, we also offer modular luminaires in which our light sources can be used.

Sales

What is the best way to proceed if I want to have such lighting equipment?

Please contact us via contact form or telephone – we will be happy to advise you. Please have information such as quantities, stock and location ready so that we can help you in the best possible way.
You can also purchase most of our products from the wholesaler Otto Fischer AG.

Where can I find your prices?

Prices vary depending on the order quantity and design. Please contact us.

Installation

Can fluorescent tubes be easily replaced by LED tubes?

This is possible. Depending on the installed ballast, however, a different procedure is required:

It is possible to leave the conventional ballast (CCG) installed and replace the FL starter with an LED starter. Normally the function is not affected. However, the warranty will be void, as the risk of failure will increase. LEDCity recommends to remove the ballast, because the lifetime of the ballast is limited and the power consumption is higher.

Electronic ballasts (EBs) must be bridged. On fittings that have been specially built or modified for LED tubes, a clearly visible warning notice with the following content: “Attention! Only suitable for LED tubes”.

I do not yet fully understand the technical details, can you help me?

We would be pleased to help you to get an overview. Please contact us via contact form.

We will be happy to help you by mail and telephone or, if you wish, we can come and visit you personally.

What kind of problems can occur after an override?

If the bridging is done correctly, no problems will occur. Please read our installation instructions and the document “Retrofit LED Tubes” of the Swiss Federal Inspectorate for Heavy Current Installations ESTI.

We recommend that you download the “Retrofit Document” and pass it on to the respective electrician responsible for the retrofit.

Do LED tubes have to be burnt in after installation?

No. Only fluorescent tubes must be burned in. Only after this burn-in period do fluorescent lamps have a stable operating value which ensures the best possible dimming behaviour and an optimum service life. We recommend around 20 hours for T8 fluorescent tubes and around 100 hours for T5 fluorescent tubes. During this time, the lamps should be operated at maximum output to ensure that optimum pressure is maintained in the fluorescent tube. LED tubes, on the other hand, are ready for operation immediately after installation.

Questions?

If your question could not be answered on this page, we look forward to hearing from you either by e-mail, using the form opposite or by phone at +41 44 500 73 85.