LEDdynamics, Inc. powers LEDs.  In LED drivers like the MicroPuck, PowerPuck and BuckPuck emerged into the LED industry helping to increase the efficiency of LEDs.  LED manufacturers, at the time, were so focused on increasing light output that efficiency was all but ignored.  Before LEDdynamics, the approach to powering LEDs was as if you glue the gas pedal to the floor of a car and use the brake to regulate the speed; products were commonly wasting half of the battery’s energy.  LEDdynamics’ LUXdrive line of LED drivers added value by maximizing LED energy potential by utilizing more of the battery power.

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A LED driver is an electrical device that regulates the power to an LED or string(s) of LEDs. What makes a driver different from conventional power supplies, is that an LED driver responds to the ever-changing needs of the LED, or circuit of LEDs, by supplying a constant amount of power to the LED, as its electrical properties change with temperature.

Think of an LED driver as ‘Cruise Control’ (like in a car) for the LED, and the temperature changes of the LED are the hills and valleys it is ‘driving’ over. The power level (or ‘Speed’) of the LED is maintained constant by the driver as the electrical properties change (amount of ‘gas’ or power needed) throughout the temperature increases and decreases (or ‘hills and valleys’) seen by the LED(s). Without the proper driver, the LED may become too hot (driving too fast) and become unstable (out of control), causing poor performance (engine problems) or complete Thermal Runaway (crash!).

In most cases, YES! The semiconductor junctions in an LED (which produce the light) require very specific electrical power to operate properly. If the voltage (electrical force) supplied to the LED is lower than required, very little current (electricity) flows through the junction, resulting in low light output and poor performance. If the voltage is too great, too much current flows and the LED can overheat and be severely damaged or fail completely (thermal runaway). Configuring an appropriate LED driver for each application is essential for maintaining the optimum performance and reliability of the LED(s).

Also, different types and models of LEDs have different voltage requirements even though they may share the same current rating. Beyond that, the voltage required to achieve the proper current can vary with temperature, composition of chemicals in the LED, etc. Therefore, LEDs with the same part number may have variations in the precise level of voltage required for proper operation. Generally, it is desirable to regulate the current flowing through each LED to the rated current to maximize the illumination and life of each costly little LED. To do this, some type of true power regulation is required. A resistor can be used as a cheap solution to restrict the current flow, but since a resistor turns power into heat to do its job, the resistor often wastes more power than the LED saves while adding to the heat that needs to be removed.

There are a few applications in portable lighting where a driver is not completely necessary and a simple resistor is used (however, this is not recommended!). This is the case for many multi-cell flashlights using LEDs since it is a very cheap solution. By placing the correct resistor in line with the LED, the available rate of power from the batteries is restricted to a level low enough to be tolerated by the LED. Since the available power from the battery will decrease as it is consumed by the LED, the light level will begin to drop as soon as the unit is turned on and power is taken from the batteries. The major disadvantages to using a resistor on an LED are linear light drop-off (light level begins decreasing as soon as power is switched on), poor efficiency (the resistor is consuming much of the power), and no thermal protection (the LED may overheat and there is nothing there to stop it!). A dynamic resistor, like the DynaOhm™ from LuxDrive, can be substituted for the resistor to improve light output and provide thermal protection.

Contact us to discuss your requirements of LED emergency driver power supply. Our experienced sales team can help you identify the options that best suit your needs.

Choosing the right LED driver is like choosing the right tool for the job. First, you need to know what that job is! Here are the main questions you should have the answers to before choosing a driver:

1. What type of LEDs are being used and how many?
2. What type of power will be used? (batteries, automotive, household, etc)
3. What are the size limitations, if any?
4. What are the main design goals? (size, cost, efficiency, performance, etc)
5. What features are desired? (dimming, pulsing, microprocessor control, etc)

Once these questions have been answered, choosing the correct driver is a matter is finding what is currently available and determining if it is suitable for your application. Use the following table or this LED Driver Selector Tool to help in determining if a driver is available for your application. Select the part number to find out more about the selected driver.

ProductTypeTopologyInput Output Dimming PDF QuadPuck DC:DCBuck12 to 24 VDC to mAPWMData Sheet QuadBlock F017DC:DCBuck12 to 24 VDC to mAPWMData Sheet PowerPuck BDC:DCBuck5 to 32 VDC350 to mANoneData Sheet MiniPuck F004DC:DCBuck6.5 to 30 VDC 350 to 700 mAPWMData Sheet MicroPuck DC:DCBuck0.8 to 3 VDC350 to 600 mANoneData Sheet FlexBlock A011DC:DCBuck-Boost, Boost10 to 32 VDC350 to 700 mA0 - 10 VData Sheet DynaOhm DC:DCLinear(2.6V + Vf) to 52 VDC20 to 30 mANoneData Sheet BuckToot DC:DCBuck5 to 28 VDC350 mANoneData Sheet BuckPuck 302xDDC:DCBuck5 to 32 VDC350 to mA0 - 10 VData Sheet BuckBlock A009DC:DCBuck10 to 32 VDC to mA0 - 10 VData Sheet BuckTitan N009DC:DCBuck6 to 30 VDC to mA5V PWM Data Sheet MultiBlock N022DC:DCBoost12 to 24 VDC120 to mANone Data Sheet BoostPuck DC:DCBoost5 to 28 VDC350 mA0 - 10 VData Sheet

If you cannot locate a driver suitable for your application, you may consider contacting a driver engineering company (like LEDdynamics, Inc.) to have a driver designed for your specific application. Many of the LuxDrive line of LED drivers can be redesigned for fit your application at little or no additional cost. Contact LuxDrive Support for more information.

NOTE: Always refer to the manufacturer’s instructions before making any connections!

In most cases, an LED driver has (4) connections: (2) for the power input and (2) for the LED. Drivers with dimming capabilities will often have (2) additional connections for a dimming pot or control connection. If you are connecting a circuit or string of LEDs, be sure the circuit is configured for the driver to be used. Incorrectly wiring the LED(s) may damage the LED(s) and/or the driver. Also, many driver manufacturers require connection of the LED(s) before power is applied.

Top Ten Questions about LED Lights Answered

21 February

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LED lights have been around for a while but are still relatively new to a lot of people. To help you get started, we've answered ten of the most common questions about LED lighting.

1. How do LED lights work?

LED (light-emitting diode) light sources work differently to traditional lighting sources, such as incandescent. Incandescent bulbs work with a burning filament at the centre of the bulb that eventually burns out. LEDs derive their light energy from electrons that move within a semiconductor material. When a voltage is applied to the leads these electrons are stimulated to create light-based energy. LEDs aren't just used for lighting either, and can be found across a wide range of electricals. For example, you can now get LED TVs that produce a better picture quality and allow for slimmer designs.

2. Are LED lights safe?

As with any electrical fitting, you need to take obvious precautions during the installation process. If you're re-wiring directly to the mains, then we always advise that you contact a qualified electrician. And, as with any source of light, it's advised you don't stare directly at them, otherwise you'll run the risk of causing damage to your eyes. However, when installed, LEDs are actually safer than older light sources such as incandescent and halogen. This is because they are fitted with heat sinks that dissipate heat away – so you're less likely to burn your fingers upon contact, unlike with traditional lighting sources that are dangerous to touch.

3. Are LED lights dimmable?

Yes they are – but you have to make sure you purchase a dimmable LED bulb. You can't just dim a standard LED bulb. You also need to make sure you have a compatible dimmer switch. If you're upgrading from incandescent or halogen to LED, it's more than likely you're currently using a leading-edge dimmer, and these aren't compatible with LED. We advise upgrading to a specialised LED dimmer, such as an LED-ready trailing-edge dimmer, that'll deliver the best performance while prolonging the lifespan of the bulb itself.

4. Are LED lights cheaper to run?

Yes, LED lights are significantly cheaper to run because they consume less energy. While they'll cost you more up-front, you'll recoup that initial investment in a matter of months, then continue to save every month after.

5. How do LED lights save you money?

There are two key ways in which LED lights save you literally hundreds – if not thousands – during their lifetime. • Cost to run. LEDs use up to 90% less energy than incandescent and halogen light bulbs, which are the most commonly-used light bulbs around. This means that when you make a switch from an older light source to LED, you'll quickly start seeing your energy bills plummet. In fact, you'll make back your initial outlay in a matter of months and continue saving thereafter. It literally pays to switch to LED! • Lifespan. Incandescent and halogen light bulbs are made to last just 2,000 hours. LEDs, in comparison, are made to last up to 25,000 hours. Based on average use, that’s a whopping 15 years of service. So not only will you see those energy bills dwindle, you'll save money on replacements too.

6. What causes LED lights to flicker?

As with any light source, LEDs can flicker – particularly if they haven't been installed properly in the first place. One of the main reasons behind LEDs flickering is the power supply they're receiving. While older light sources require an AC power supply, LED bulbs require a DC power supply. That's why it's so important to have an LED driver that converts your power supply from AC to DC. This will ensure there's a constant supply of power to your LEDs to combat any flickering. Most LED bulbs have the driver built into them, but certain types of LED lighting require a separate driver to power them. Simply check before you buy.

7. How do LED lights help the environment?

LED's consume very little energy, particularly when compared to halogen and incandescent equivalents. You can replace a 100W incandescent bulb with a 10W LED and still enjoy the same level of light output, while reducing greenhouse gas emissions. Plus, LEDs don’t contain toxic chemicals such as mercury, unlike fluorescent lights that contaminate the environment when disposed of. Finally, LEDs last up to 20-times longer than any other traditional form of lighting, reducing the number of replacements you need and further lowering your impact on the environment.

8. Do LED lights get hot?

You can expect a little bit of warmth radiating from your LED lamp – but a lot less than halogen and incandescent equivalents. This is because LEDs use 90-95% of their energy supply to produce light, while the other 5-10% of energy used produces heat – the opposite being true for older bulbs, which is why you have to careful when changing them.

9. Are LED lights good for growing plants?

They are indeed. You can now get LED hydroponic lamps that help stimulate plant growth by providing the optimum amount of light wavelength and intensity required for different growth phases, but without the inefficiency that comes with CFL and incandescent grow lamps.

10. Are LED lights bad for your eyes?

As with any source of light, we strongly advise that you don’t stare directly at LED lights as they could subsequently cause eye damage. Apart from that, no, they’re not bad for your eyes! If you're ready to make the switch you can find all of our LED lights here.