LED Information

Selecting a power supply for LED products

Selecting the LED transformer

There are many different transformers or power supplies, such as constant voltage, constant current, and dimmable.

In general, from power sources

1. Correct voltage. If the product requires 12 V, it does not fit a 5 or 24 V power supply.

2. Sufficient power. The power supply must provide at least the maximum power taken by the load. Greater power is not a danger, but there is no point in paying for it if you can do with the smaller ones. A 5 A power supply is not required for a couple of little LEDs. Overload should not be put on, the chipper is constantly pushing to full speed and the service life is reduced. It is recommended that the rated power of the power supply should be at least 10-20 higher than the maximum load.

3. Installation location. All ac adapter models are suitable for the dry room. If you hide the power supply behind the panels, install it on a terrace or in a moisture-prone area, choose the IP66/IP67 model, which is designed for demanding conditions. The recommended ambient temperature for power sources is max.40°C. 4. Connection method. Appliances with a plug ready are connected to the wall socket. Do not cut off the cord. IP-protected devices have fixed power cables, installation is done directly into the terminal box or by plugging in the plug, thus plugging it into an electrical outlet.

Check out all of our power supplies here.

Selecting a power supply for LED Strip

Standard voltage transformers are used for LED strips. The most common voltage in LED strips are 12V or 24V.

The 12V LED tapes are suitable for 12V constant voltage sources.

The 24V LED strips are suitable for 24V constant voltage sources The suitable LED power supply power is 10-30 higher than the calculated power requirement for LEDs.

Selecting a power supply for LED Down lights

For example, standard current transformers are used in LED Downlights. They also have ready-made kits including power supplies.

Dimmable power supplies

The most common dimmable power supplies are DALI dimmable, Triac dimmable or Push-button-controlled power supplies.

Keep in mind that DALI power supplies require DALI controllers or adjustments.

How to calculate the appropriate power supply?

For example, on an LED tape, the length of the tape affects how effective (wattage) the transformer is needed. Since the LED strip can be cut into the required length of snippets, it is good to know how to determine the need for an LED transformer. To determine the maximum length of the LED strip, use the rule of thumb: divide the power supply power at the power of the LED strip per metre. Then add at least 10 funds so you don’t load the transformer at its maximum power.

As an example if using a 5m high power LED tape 14 W/m 12V is required:

5 m * 14 W/m = 70W + 10-30 oversizing = 70W + 10 = 77W

So you need a minimum 77W power supply because when previously told, the led power is recommended to be 10-30 higher than the calculated power requirement for LEDs. That is, the correct power supply would be, for example, the AC adapter 230VAC/12 VDC 6.7A.

For example, if you select a lower power LED strip of 7.2 W/m 12V, then the same power supply ( AC adapter 230VAC/12 VDC 6.7A. ) can be connected up to 10 m

80 W divided by 7.2 W/m * 0.9 (minimum 10 overmoting) = 10 meters.

If you know how much you need led strip, then multiplying the number of meters of the strip at its power, you can the power of the transformer.

You just have to remember that in practice it’s a good idea to dimension the LED power supply so that you have 10 leeways compared to the maximum power load of the transformer. In this case, the power supply also lasts longer because the entire time is not in maximum loads.

Our customer service team will be happy to help you choose the right LED transformer.

If you can’t find our online store or don’t know what a suitable power supply would be for you, please feel free to contact our customer service: info@ledlife.fi or call 040-5533908.

We’d be happy to help.

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