Everything about leds basics of high power led lighting tgask


LEDs are appropriate for many lighting applications, they are designed to produce a lot of light from a small form factor while maintaining fantastic efficiency. Here at LEDSupply there are a variety of LEDs for all kinds of different lighting applications, the trick is knowing how to use them. LED technology is a tad different than other lighting that most people are familiar with. This post is here to explain everything you need to know about LED lighting: how to power LEDs safely so you get the most light and the longest lifetime possible.

An LED is a type of diode that turns electrical energy into light. For those that don’t know, a diode is an electrical component that only works in one direction. Basically an LED is an electrical component that emits light when electricity flows through in one direction, from the Anode (positive side) to the Cathode (negative side). LED is an acronym standing for ‘ Light Emitting Diode’. Basically, LEDs are like tiny light bulbs, they just require a lot less power to light up and are much more efficient in producing high light outputs. shale gas in spanish LED Types

5mm LEDs are diodes inside a 5mm diameter lens with two thin metal legs on the bottom. They are used in applications where a lower amount of light is required. 5mm LEDs also run at much lower drive currents, maxing out at around 30mA, whereas Surface Mount LEDs require a minimum of 350mA. All our 5mm LEDs are from top manufacturers and are available in a variety of colors, intensities and illumination patterns. Through-hole LEDs are great for small flashlight applications, signage and anything where you are using a breadboard as they can be used easily with their leads. Check out our guide to setting up 5mm LEDs for more info on these tiny light sources. Surface Mount LEDs (SMD)

Surface Mount LEDs are diode(s) that can be placed on a substrate (circuit board) with a silicon dome over the diode to protect it (see Fig. 1). We carry high-power Surface Mount LEDs from industry leaders Cree and Luxeon. Both are excellent in our opinion, that is why we carry them after all. Some prefer one over the other but that comes with experience and knowing what to look for. Cree tends to have higher listed Lumen outputs and are a market leader in the High-Power LED sector. gas in michigan Luxeon, on the other hand, has excellent colors and thermal control.

High Power LEDs come as bare emitters (as seen in Fig. 1) or mounted to a Metal Core Printed Circuit Board (MCPCB). The boards are insulated and contain conductive tracks for easy circuit connections. Our 20mm 1-Up and 3-Up star board designs are the best sellers. We also offer QuadPod’s which can hold 4 high power LEDs on a board slightly larger than the 20mm stars (see Fig. 2). All our high power LED options can be built on a linear design as well. elektricity club The LuxStrip can house 6 LEDs per foot and are easily connected up to 10 feet long.

We try to carry similar color temperatures and wavelengths for each brand and type of LED. You can always find the color or wavelength of our LEDs on the sub-section of the product page and can even search by color from our LEDs dropdown menu on the homepage. In white, we carry 3000K, 4000K, 5000K and 6500K. As far as colors go, we carry from 400-660nm. LED Brightness

LEDs are not only known for the colors, they are also a lot brighter than other light sources. Sometimes it is hard to tell how bright an LED will be because it is measured in Lumens. A Lumen is a scientific unit measuring luminous flux or the total amount of visible light from a source. Note that 5mm LEDs are usually listed in millicandelas (mcd). For 5mm LEDs, their viewing angle also affects the light output they give off, for more on that see here. Why drive current matters…

Now comes the tricky part, selecting the LED and driver combination that will output the light needed. We have done a lot of the ground work here, in a post measuring the brightness of each high power LED at different drive currents. Take note that these are measures for 1-Up stars so if you want more light the 3-Up LEDs are a good option as they are triple the light within the same footprint.

In this example we are using the Cree XP-L. First find the Flux Characteristics table (figure 5). We will touch on binning later which is labeled in the ‘Group’ column, but let us assume we are going to use a cool white XP-L from the highest bin (v5). electricity word search puzzle The highlighted number is the typical flux @ 1050mA which is the current the XP-L is measured at. To the right of that are the typical Lumen numbers for 1500, 2000, and 3000mA drive currents.

So now to find Efficacy, we just need to divide 742 Lumens (the tested amount of Lumens for this LED at 2000mA) by 6.3 Watts. So the Efficacy (Lumens/watt) of this Cree XP-L is 117.8. This is great efficacy but also note Cree boasts that the XLamp XP-L LED has breakthrough efficacy of 200 lumens/watt running at 350mA. It is good to know that the efficacy goes down as you run more current to the LED as this increases heat which does make the LED a bit less efficient. gas hydrates wiki Sometimes you will need to accept this if you need the LED to be very bright, but if you are wanting to get the best efficacy then you should run LEDs at a lower current. This is all helpful in determining how much power your applications will need as well as figuring out energy savings down the road. A little bit more on LED drivers

This means that you need to find an LED driver that has the capability of driving LEDs at the current you need in order to get the amount of Lumens you’d like. An LED Driver is an electrical device that regulates the power to an LED or string(s) of LEDs. The driver responds to the changing needs of the LED by supplying a constant amount of power to the LED as its electrical properties change with the temperature. A good analogy in understanding this is that of a car on cruise control. As the car (LED) goes through hills and valleys (temperature changes), the cruise control (driver) makes sure it stays at a steady speed (light), regulating the gas (power) needed in doing so. The driver is so important because LEDs require very specific electrical power in order to operate properly. If the voltage supplied to the LED is lower than required, very little current runs through the junction, resulting in low light and poor performance. On the other hand, if the voltage is too great, too much current flows to the LED and it can overheat and be severely damaged or fail completely ( thermal runaway). Always make sure you check the LEDs datasheet so you know what current is recommended to avoid these issues. hp gas online booking How much voltage do I need to light up an LED?

This is a common question asked and is actually pretty easy to figure out. All you need to know is your LED(s) forward voltage. If you have multiple LEDs in series than you need to take into account all the forward voltages combined, if you have a parallel circuit than you only need to take into account the forward voltage of how many LEDs you have per string. For more on wiring setups see here. It is a good idea to keep at least a 2 volt overhead as some drivers (like the LuxDrive drivers) require this for the driver to work properly. So if your total forward voltage for a series circuit is 9.55, you should be safe with a 12V supply. For off line drivers (AC input) just know the output voltage they are rated at and make sure you are covered, so a AC input driver with an output range of 3-12VDC would work for this application as well. Heat Control

Finding wattage of your sytsem also helps you know more about the heat control you will need. Since these LEDs are high-power, they do create heat which can be very bad as you can learn here. Too much heat will make the LEDs produce less light as well as cut down on the lifetime. We always recommend using a heatsink and like to say to use about 3 square inches for every watt of LEDs. electricity worksheets ks1 For larger wattages I would recommend looking for a heatsink that is recommended for the amount of watts you are running. LED Binning & Quality

With the LED industry growing at a pretty rapid pace right now, it is important to understand the difference in LEDs out there. This is a common question as LEDs can range from very cheap to very expensive. I’d be careful in buying cheap LEDs as you always get what you pay for, yes the LEDs might work great at first but they usually tend not to last as long or will burn out fast because of poor testing.

All the LEDs carried here at LEDSupply are carefully selected. We only stock the best brands and color temperatures. Our vast experience in the industry has helped us learn the importance of quality manufacturing and binning of LEDs as well. In the manufacturing of LEDs, there is a variation of performance around average values in the technical data sheets. For this reason manufacturers bin the LEDs for luminous flux, color and forward voltage. We select the bins with the highest luminous flux (visible light) and lowest forward voltage, as this makes sure we have the LEDs with the best efficacy. A large amount of LED products are cheaply made and not documented correctly, which leads to many failed projects and then makes people think LEDs actually don’t last as long as they are said to. gas monkey bar and grill With our experience and buying power, we are able to offer the best products at reasonable prices.