Questions & Answers
Technical

All LEDs, or part of the LED chain, or some single LEDs, do not work or work intermittently.

There may be a short circuit; the problem can be electrostatic or caused by the protective device that has switched off automatically.  Find the cause of the short circuit and power the circuit again, then replace the modules that are no longer operational.  With intermittance, the contacts may be weak, or there may be a problem of oversupply; in this case check the contacts and make sure that the output voltage is not above 12 Volts.

The LED luminosity is not constant or not sufficient.

The power supply's cables are losing too much current. Increase the cable section or increase the number of lines or the number of power supplies.

How do I choose the most suitable power supply?

We recommend always using good quality and stabilised power supplies, calculating a tolerance margin that is at least 15% higher.

When is a power supply called SELV and what makes it different from the other types of power supply?

SELV (Safety Extra Low Voltage) power supplies are extremely low voltage electric systems which do not cause the risk of electrocution.
Only devices that comply with the IEC 64-8 and IEC 64-14 standards are suitable, and only if they comply with the EN 61347-2-13 (IEC 34-115) directive.  Even if not requested by the directive, the manufacturer can indicate “SELV EQUIVALENT” on the power supply casing.
With a SELV power supply, the nominal voltage is less than or equal to 50 V alternate current, or 120 V direct current (not undulating).  The SELVs supply power from an independent source (battery) or a transformer with double safety insulation.  Earthing must not exist for any reason, and insulation must be guaranteed from every other circuit by double insulation or a metal screen on the ground.  It must therefore be impossible to connect the plug of a SELV system to the socket of any other system.  SELVs are different from PELVs (Protective Extra Low Voltage), which can have a point of the circuit connected to the earth potential, and from FELVs (Functional Extra Low Voltage) that must be connected to earth and are not necessarily insulated from other electric circuits.  Safety insulation is not guaranteed with these systems.

Can more than 50 modules be connected to the same power supply?

Yes.  Some power supplies can supply more than 600 modules, all that needs to be done is create several lines of 50 modules.

What distance must be kept between the power supply and the LEDs?

The power supplies must be kept as close as possible to the LEDs; if they cannot be installed near to each other, we recommend using thicker cable sections to prevent voltage drops.

How can I prevent voltage drops?

By using power cables with a section that is suitable for absorption.

What section do the connection cables have to be?

This depends on many factors.  The choice of cable must be studied case by case.  We recommend contacting our technicians for personalised indications.

Are LEDs suitable for any type of sign or box?

Yes, the various types of available LED make it possible to illuminate almost anything without any limits.

Is it convenient to use LEDs on large signs?

Yes, using LEDs has reached yield and price levels that make it convenient, above all for large signs where energy saving is greater.

Can LEDs be installed where they are exposed to bad weather?

LEDs assembled on clear casings with an IP 68 rating are suitable even for outdoor exposure.

At what distance must the rows of LEDs inside a box or in channel letters be placed?

Indicatively, the distance between the rows of LEDs inside a box can be equal to its depth.  Consider, however, that each project is unique and must be evaluated individually.

What is the difference between HLC Series and ECO Series LED modules?

The HLC series has circuits mounted, called stabilisers, that have a protection device for controlling the current and the voltage.  The ECO series is not stabilised, therefore it is not protected from drops in voltage.  In this case it is advisable to use high quality power supplies.

What are the applications and differences between 2-diode modules and 3-diode modules?

2-diode modules are used mainly in channel letters and small and medium sized boxes, with a depth of between 8 and 12 cm.  3-diode modules are used in medium and large sized boxes and channel letters, which helps save the number of elements to be used.

What does 3528 or 5050 mean?

The numbers used to name the LED modules indicate the size of the diode that makes them up.  As an example, 3528 means that the module is made up of diodes of 3.5x2.8 mm; the diodes of the 5050 module are square and measure 5x5 mm.

What temperature in kelvin are warm white and cool white?

Cool white is 6500 kelvin and warm white is 3000 kelvin.

If you did not find an answer to your questions, please consult Technical assistance & Advice; our technicians and consultants will suggest the best solutions for you.