Finding the right power supply for your LEDs is essential whether you're creating your own LED fixture, repairing and retrofitting an existing fixture, or buying new LED lights. For your LEDs to function correctly, you will want either a constant voltage power source or a constant current LED driver, or a combination of the two. When selecting a power source for LED lighting, there are several aspects to take into account. This article will go over all of those variables and assist you in choosing the best power source for your LEDs.
To avoid being overdriven, the majority of LEDs require a current-limiting device, which might be resistors or a driver. By controlling the current flowing to the LEDs, this constant current driver or current limiting resistor keeps them operating safely and extends their lifespan. As LEDs heat up, their electrical properties change; if current is not controlled, they will eventually draw excessive amounts of current. The LED light will ultimately fail due to excessive internal heat caused by this current overdraw, which will cause the brightness to vary. You will want a constant current device in your system whether you are constructing your own LED fixture or using any of our component star LEDs. Drivers or resistors to control the current are already present in the majority of completed LED goods or LED strip lights (which you would purchase directly from the shop). You may find out if you require a steady current supply by reading this comprehensive post. Finding a driver is the first step if you don't have a current limiting device. If your LED product currently has current under control, you may use this page to find a power supply with a constant voltage.
Constant Voltage Power Supplies
LED lights that are already equipped with resistors or constant current drivers can be powered by a constant voltage power source. A steady DC voltage is usually required for these kinds of goods. You are fortunate if you are using a battery to power your lights or if you have a steady DC voltage that is sufficient for them. This is seldom the case, and you will want a power supply to transform your electricity into a safe DC voltage for your lights. If you were to put LED flex strips in your automobile, for instance, you wouldn't need a power source because they come with on-board current limiting resistors. Vehicle batteries emit 12VDC, give or take. Your lights would be fully supplied by the battery's 12V power. However, an AC to DC converter is required in order to integrate these strips into houses. This converter must be able to convert the usual household voltage of 120VAC to 12VDC.
How to Choose the Right Power Supply?
Therefore, you require a power supply of some kind that can transform your home's AC voltage into a safe DC voltage. Finding the ideal power source for your need involves a number of considerations. Locking down the electricity we need from our power supply should be our first priority.
Wattage
To get started, find out how many watts your light will consume. If you hope to run more than one light off of one power supply, you must sum the wattages up to find the total watts used. Make sure to have a large enough power supply by giving yourself a 20% cushion over the total wattage you calculate from your LEDs. This can easily be done by multiplying your total wattage by 1.2 and then finding a power supply rated for that wattage.
Say for example we have 4 runs of LED strips that run at about 12 watts each. Simply multiplying these will show that our system wattage should be right around 48 Watts. Now we can add the 20% recommended cushion on with 48 x 1.2 = 57.6 Watts. A 60-Watt (or higher) power supply will suffice for this project.
Voltage/Current
It is crucial to confirm that the output voltage is compatible with the LED voltage before constructing an LED fixture or replacing a malfunctioning power supply. When it comes to determining the appropriate input voltage, LED solutions with integrated current regulators are often rather good. For example, our LED flex strips would be powered by a 12V supply as that is what they need.
Using high power LEDs with constant current drivers that need a DC voltage input is another popular use case. Let's say a Mean Well LDD-H driver powers six Cree LEDs. About 3.1 volts is needed to run each LED. In this series circuit, we would have a total voltage of 18.6VDC with six of them. Low voltage drivers, such as the Mean Well LDD-H, usually function better when you have a little margin over the voltage they need. I would need a power source that outputs at least 24VDC for this configuration. Keep in mind that you should always confirm that the low voltage driver you are using-in this case, Mean Well LDD-H-is rated for the voltage you wish to input. We are covered in this case because the Mean Well LDD-H can accept 9–56VDC. Learn more about how to determine your voltage in various circuits here.
Additionally, confirm that the power supply you choose is capable of handling your input power. Where you are in the world will affect the line voltage. Verify if you have high-line AC power (200-240VAC) or low-line AC power (90-120VAC). Many power supplies, like those made by Mean Well, are rated for the entire range, but it's always useful to know what your AC input is so you can be sure the power supply you pick is appropriate for it.
Dimmable LED Power Supplies
Make sure you select a power supply with dimming capabilities if your LEDs are dimmable and you want to change their brightness. A power source's dimmability and the type of dimmer control it uses should be specified in the power supply specifications. I'll quickly review the two types of controls:
PWM Dimming:All power supply may employ pulse-width modulation dimming, as it is also called. Wall-mounted or remote PWM dimmers can be used to dim even the power supply on our website that don't specifically state "dimmable" in the specifications. This occurs as a result of PWM dimmers dimming on the circuit's 12VDC side in line with the strip lights. In order to alter how light appears to the unaided eye, PWM dimmers actually pulse the lights at high frequencies. They will be brighter at higher frequencies.
TRIAC Dimming:LEDs can be dimmed using conventional dimmers thanks to this kind of dimming. You must examine the specifications to make sure a power supply is eligible for alternating current (TRIAC) dimming. Magnitude Dimmable Power Supplies are one of our current products that provide dimming controls such as these. Through the use of a TRIAC dimmer, these power supply adjust the power on the AC side of the circuit. The voltage on the DC output will fluctuate and the LEDs' brightness will be controlled by the power shift that the dimmer produces on the AC input side. Common hardware stores have TRIAC dimmers. Lutron and Leviton are the most well-known and well-known brands.
Temperature and Weather
The location and environment in which your power supply will be utilised are crucial considerations that should not be disregarded. When power supplies are operated within their temperature range, they perform at their best. A safe operating temperature range should be included in power supply specifications. working within this range is ideal, and you should avoid placing your power supply in an area where heat can accumulate and cause it to rise over its maximum working temperature. Placing a power source in a small enclosure without a ventilation system is usually a bad idea. This will eventually cause the power source to get overheated due to the accumulation of even the small amount of heat generated by the source. Therefore, make sure the temperature isn't too high or too low and that the heat doesn't accumulate to a dangerous degree.
An ingress-protection (IP) rating will also be assigned to each LED power supply. A two-digit code that represents the size of particles and the pressure of liquids that a power supply can withstand makes up IP ratings. The unit's tolerance for solids is indicated by the first number, while its tolerance for liquids is shown by the second. The degree of protection rises with each number. The product is shielded by progressively smaller things (down to dust particles) as the first number rises, decreasing the likelihood that anything will enter and damage it. The product is now protected in full immersion as opposed to only mild rain as the second number rises. Make sure your power supply has an IP rating that will shield your source from the environment it will be in by looking at the useful table below.
Efficiency
The amount of electricity that truly goes into turning on the LED is indicated by the power supply's efficiency. The more electricity you save, the higher the power supply's efficiency %. A power supply with 80% efficiency or above is a smart choice for LED applications. With efficiency ratings far into the 90 percentile, Mean far and Phihong power supply are the most economical options.
Size
Knowing where the power supply will fit or be put is crucial when choosing one for your LED project. It must be tiny enough to fit in the designated space if you want to include it in the product you are creating. It should have a nearby mount option if it is outside the program. To meet your demands, a range of power supplies are available in various sizes and forms.
Class II or Class 2??
Now that we are nearing the finish of our study of LED power supply, let's make sure we grasp these two ratings because they are often confused. A Class 2 power supply satisfies Standard UL 1310 standards and conforms to the National Electric Code's (NEC) regulated power levels. Class 2 power supply can only provide up to 100 watts at 60VDC. Class 2 power supplies are not able to power as many LEDs as those outside of their category due to their low power. At this point, you have to decide if you want to use a Class 2 power supply, which is safe against electric shock and fire, or run a greater distance from a single power source.
In reality, a Class II classification only denotes that the input and output wires are doubly insulated. Because Class II drivers don't need a ground connection, they are widely used.
