What is the power of the LED tape and how to determine it?

The power of the LED tape is the second after the rated voltage of the parameter to which consumers pay attention. After it is checked for tape fitness for certain weather or microclimate, other parameters.

What does it depend on?

The power of the LED ribbon depends on the two characteristics – the operating voltage of the supply and consumed by each current LED. Power is equal to the product of LED LEDs for ampezh (current strength). The strength of the current with a sequential connection of the LEDs (in assemblies at 12, 24, 220 volts) is the same – it depends on the characteristics of a specific light element, of which (fully identical) and is going to say.

Collect different LEDs in the power of the LEDs in one assembly is not recommended – LEDs low power glow brighter, greater – much more dim. If the lamp is a driver in which it is stabilizing precisely on the strength of the current under the LEDs of less power, the lamp will not shine, or the glow will be pixelized, fragmentary depending on the power of each LED. In the case of connecting a long ribbon with different (not the same) LEDs to the source higher than a few volts, voltages, low-power LEDs burned, and after them, if there was a heat breakdown, and the LED has become a conventional conductor, burned and the rest.

Despite the fact that even the LEDs of one party are slightly raised along the voltage (within the hundredths of Volta), it may turn out a small “dispersion”.

This feature is non-critical – some LEDs shine almost weaker, in the lamp or light bulb with a matte diffuser, this small difference is invisible.

How to calculate power?

To calculate the power there is a table of values ​​of the nominal voltage and consumed current. According to it, the LEDs of different nominal have excellent consumption current from each other. For example, light elements, similar to the usual LEDs production of the USSR times, which, in turn, were installed in the display panel of long-distance telephone equipment (RPL equipment), differ in consumption current at 15-30 milliam with a voltage spread of 2.7-3.2 volts. In any case, it is impossible to exceed these parameters – Ideally, the LED almost should not be heated at all. It is allowed to heat up to a temperature no more than the body of a healthy person (not warmer finger). Always remember that the LED is not a gas-discharge or heat lamp, it almost should hard. If the voltage is 3.4-3.8 V, then the heating becomes more significant – to a temperature of 50-55 degrees, and the voltage of more than 4 volts and will lead to its accelerated degradation (the LED will fool up to 70 degrees, After that, he simply sends – “makes his way” on warmth and comes into disrepair).

1 meter

Let us give example. 220 volts tape, working long sections on SMD LEDs, has 60 pieces per section. Of course, if you count on the characteristics, without overload, in the case of self-software from individual LEDs ordered by the party in China, 80 would. Here it calculates that the tape will work at least the claimed 25 thousand. hours, and not “interrupt” somewhere between the 2000th and 3000th hours of real work, as often happens as a result of a deliberate exit outside the operating parameters.

so, SMD-5050 has a power of 0.1 watt. 60 pieces – already 6 W. Light leaf tape 1 meter is 480 lumens (8 lm per LED). You can find out the current of consumption “from the outlet” by dividing 6 W at 220 V. As a result, we get 27 mA consumed from the network. In reality, some losses (up to 5%) fall on a diode bridge – it is slightly heated, so actually the tape consumes 30 mA of alternating current at 220 V. And if you take (as often happens) the heat dissipation of LED overwhelmed over the current, then another 40-50 will go to heat. As an example – LED bulbs, the base of which even burns the hand (70 degrees, +50 to room temperature, in the form of heat), then the loss on the heat of the LEDs and the rectifier (or driver) is poured in 60% or more. As a result, instead of 30 mA at 220 volts, the entire assembly will take 50 million.

In terms of power, under the light of 6 W, the actual (total) consumption of lights with a rectifier may pour out at 10-15 W.

Long ribbon

Take as an example all the same LEDs – SMD-5050. On meter (60 pcs.) Their light flows are estimated at 6 W, when consuming in 10-15 (the rest of the watts, as previously stated, go to heat because of the wrong calculation). If a meter is 6 W on the meter, then for the entire length, suppose, the corridor (100 meters, the first floor of the factory or plant, the transition between the workshops) of the tape will give light by 600 W. In this case, consumption will be, like a single-mounted electric cooker or an oil electroderator – kilowatt and more. Ribbons for power from 220 V are often included through the automatic fuse on the “phase” line wire – the current of its operation is equal to several ampere. If the luminosity of the tape changes from the voltage throw, this automatic fuse will “shoot”, will open the line, and the tape will be de-energized.

For example, 5 Stater ribbons from such LEDs can be enabled through a standard DIFAVTOMAT for 25 A, used in apartments and country houses.

Calculation of the converter

If the light lighting of 220 V does not require anything, except for the rectifier with the filter (condenser) to the same voltage, then 5-, 12- and 24-volt mini assemblies need an additional converter. As the latter, a current driver or a stabilized power source is used for this low voltage, calculated with a slight margin in order to avoid “sizing”.

The simplest example – driver in standard base light bulbs E-27 sizes. 3 W Light Bulb contains 5-6 LEDs, distributed in a round board with an aluminum substrate. The latter is used as a discharge heat. Practical advice of self-drainers who repaired such light bulbs are reduced to increasing the resistance of one of the resistors so that the driver can hardly heat.

For example, instead of the minimum 18 ohms it is required to put a resistor on 40. Putting into the breaking of the Light Additional Supplementary LEDs does not result in: The driver has a “stroke”. Its microcircuit will still go to “Perekal”, as the current taking the reserve. Such a light bulb, and indeed, shines at 3-5 W, but consumes energy for unnecessary heat even at least as much. In 3-watt light bulbs, 5-6 double LEDs are used (are included in pairs with an internal serial compound, double crystals), each of which consumes normally 6 in. In practice, the manufacturer so that the lamp is glowing as much as possible, all 8 volts will remove the double crystal. Five such crystals – 40 volts, 6 – 48.

If the light is calculated on 10 crystals, and it indicates that its power is 5 W, then the driver produces a permanent current of the voltage already 80 volts – in the normal one should give only 60. Another 5-10 W scattered on unnecessary overheating. The technology of calculating the converter is broken, and soon it burns after purchase with one or more LEDs. That this does not happen, homemade masters, changing the currently controlled chip restrictive resistor, achieve a normal mode of operation. The light bulb is shining not at 3 (or 5) watts, and by 2-2.5 (3-4), its brightness of the glow falls twice. The fact is that even in an unwrapped mode of loss of 5-32% for a small heat released by the driver (depends on the complexity of the scheme and the quality of electronic components), persist.

Conclusion: calculating the converter, it is impossible to be overheated. If the tape power of 1 m long is 6 watts, use the power supply or driver with a reserve by 2-3 times. In this example, its power (maximum, not peak) is equal to 12-18 W. Surrounding this value, do not regret money on a 20-watt power adapter.

And he, and your link will work without problems 10 years or more.

How to calculate consumption?

Practical example – try to measure the need for light with the help of already purchased LED bulbs of the base type. If, say, there will be 3 tonsive light bulbs on the kitchen-living room (in a large chandelier), then repel from this value. Your task is to calculate what length is the wall (or ceiling), which runs around the perimeter of the tape room will need.

As an example, all the same links on SMD-5050 light elements. One meter – six watts. To create a light transmission of such power, take 5 m such a tape. It is released in a prayer – in the coil at the total length indicated on the package. It will pass on one of the walls, for example, above the sofa and door, from one of one of the longest, opposing each other in relation to a friend of the walls. And three light bulbs, and five meters of lights ideally will require 30 W per hour of continuous operation. Check whether the real parameters correspond to the claimed, can be compared by comparing the return of LEDs of different brands.

If you do not want to bother with detailed calculations, then you will receive an idea of ​​a similar output power of the LED light bulbs – and consider how much meters of ribbon.

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