Why,Voltage,Drop,Occurs,LED,Li technology Why Voltage Drop Occurs In LED Lighting Strips

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Voltage drop or 'volt drop' happens in all types of electricalinstallations. When larger power cables are being installed more complexcalculations must be made to counteract the problem. However when LED lighting stripsare concerned there are a few simple guidelines to follow.Volt drop in LED strips occurs when the LEDs are positioned toofar away from the power source or when longer individual runs (or lines) areattempted. This happens because not enough power or electrical current reachesthe LEDs, because it has further to travel. This causes the voltage to declineor drop towards the end of the run.Voltage drops out approximately 0.6V every metre and is lessnoticeable with 24V strips. When using 12V strips, a 2-3V drop over a 5 metrerun would reduce the voltage by 25% subsequently reducing the lumen(brightness) by a similar percentage.Volt drop could be compared to a person climbing a mountain, thehigher the altitude, the thinner the oxygen becomes and the less the person canbreathe.The LEDs at the start of the line will appear bright at 100%output but the LEDs towards the end of the line will start to fade. Thebrightness will reduce exponentially; the further away it gets away from thepower source. Potentially the light output could be reduced to 0% if greaterdistances were incorrectly attempted and cause permanent damage to the LEDs.Volt drop in single colour strips are barley noticeable,especially in shorter lengths. Colour changing strips are more visible when youturn the colour to white. If there is not enough voltage towards the end of thestrip the clear white colour will turn pink towards the end of the line. Thisis because white colour is mixed from red, green and blue (RGB). However, thered requires less voltage than green and blue. When the strip is far from thepower supply, green and blue don't get enough voltage and become weaker, whilstthe red colour becomes more prominent and turns white into pink.The higher the wattage of the LED strip, the short the runshould be. For example; 30 LED (7.2W) per metre strip can have a maximum run of10 metres, compared to the 60 LED (14.4W) per metre strip which can have amaximum run of 5 metres.This does not mean you can't install longer runs of LED strip,it just means that you need to take a different approach. Single colour stripsand colour changing (known as RGB) strips are different because colour changingstrips need to be controlled from one controller. Using a higher rated powersupply does not fix the problem as the current still has to pass through a longline of LEDs and resistors, each one draining small amounts of power.Single colour strips should be wired directly back to the powersupply in 5 metre of 10 metre runs depending on the version of strip i.e. 30 or60 LED that is used. Each run will be powered directly from the power supplyand can be turned on or off by switching a switch or unplugging it from themains. The power supply is usually wired to a light switch but could be controlledby various types of controllers. The strips can then be positioned however youlike, in one long line or in a rectangle shape for example. Once the strips arepositioned next to one another the light will appear seamless, like afluorescent tube. The run could be over 100 metres in length as long as thepower supply was rated appropriately.Volt drop will occur slightly in the connecting power cables butas there are no LEDs or resisters etc draining the current, the volt drop willbe barley noticeable. Thicker cables can be used to reach further distances.For longer runs of colour changing strip, you need to fitamplifiers every 5 or 10 metres. Amplifiers allow the strips to be poweredindirectly from the power supply but also allow the signal from the controllerto pass through the entire run of strips.  This way when you turn thecolour to red for example, everything turns to red at the same time. Theamplifiers power the strip, the power supply powers the amplifiers. Amplifierscan even be powered from their own separate power supply and you could have asmany power supplies as you like on the same run. The power supplies can bepositioned closer to the LED strip connection or wherever is most accessible.For longer, more complicated runs we can supply our customerswith their own easy to follow wiring diagram. The diagram illustrates how thepower supply, strips and cables are connected together. As part for our LEDStrip Fit brand, LED strips can be supplied to the exact lengths required; everythingapart from the larger hard wired power supplies can be plugged into each,requiring no tools or electrical knowledge.