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Transformer For 12V LED Lights

How to Select Appropriate Transformer For 12V LED Strip Lights

Step 1: Calculate the power consumption of the strip you want?

Step 1.We can calculate each strip’s power by knowing the LED Type and its rated power for each LED. The formula to calculate is Power Consumption = Wattage of each LED*LED QTY of strip Length. For example, for 100cm long SMD3528, 150LED/roll model, it’s 30LED per 100cm, so its power consumption is 30*0.08= 2.4Watt.

A: Single Chip SMD3528 0.08watt / LED

Strip Model 3528,150LED/Roll 3528,300LED/Roll 3528,600LED/Roll 3528,1200LED/Roll
30LED/Meter 60LED/Meter 120LED/Meter 240LED/Meter
500cm 12Watt 24Watt 48Watt 96Watt
300cm 7.2Watt 14.4Watt 28.8Watt 57.6Watt
200cm 4.8Watt 9.6Watt 19.2Watt 38.4Watt
100cm 2.4Watt 4.8Watt 9.6Watt 19.2Watt
50cm 1.2Watt 2.4Watt 4.8Watt 9.6Watt
1feet(30cm) 0.8Watt 1.6Watt 3.2Watt 6.4Watt
Remark: 1Roll of the strip is made in 5meters (16.4feet). 1feet=30cm. 1inch=2.5cm.

 B: Side viewing SMD335 0.08watt / LED 

Strip Model SMD 335 500cm 300cm 200cm 100cm 50cm 1feet(30cm)
300LED/Roll 60LED/M 24Watt 14.4Watt 9.6Watt 4.8Watt 2.4Watt 1.6Watt
600LED/R 120LED/M 48Watt 28.8Watt 19.2Watt 9.6Watt 4.8Watt 3.2Watt
Remark: 1Roll of the strip is made in 5meters (16.4feet). 1feet=30cm. 1inch=2.5cm.

C: Top viewing SMD5050 0.24watt / LED 

Strip Model SMD 5050 150LED/Roll 300LED/Roll 600LED/Roll
30LED/M 60LED/M 120LED/M
500cm 36Watt 72Watt 144Watt
300cm 21.6Watt 43.2Watt 86.4Watt
200cm 14.4Watt 28.8Watt 57.6Watt
100cm 7.2Watt 14.4Watt 28.8Watt
50cm 3.6Watt 7.2Watt 14.4Watt
1feet(30cm) 2.16Watt 4.32Watt 8.64Watt
Remark: 1Roll of the strip is made in 5meters (16.4feet). 1feet=30cm. 1inch=2.5cm.

 

Step 2: Choose the appropriate type transformer

Step 3: Select the right AMP

A: LED Lights AMP For SMD3528 LED Strip Lights
if you ordered 1 reel SMD3528 with 300 LEDs (24 watt), and need a waterproof power supply, then check the Waterproof LED transformer, and choose 2.5AMP(30 watt).
B: LED Lights AMP For SMD 5050 LED Strip Lights
if you ordered 2 reel SMD 5050 with 300LEDs (total 0.24*600 = 144 watt) and just want one transformer to run, then can can choose the non-waterproof heavy duty adapter, and choose 15AMP (180 watt)
C: Wattage of the power supply must higher than the actural power consumption
for one reel SMD3528 led strip with 300 leds, the power consumption is 24 watt, but we recommend you choose DC12V 3A AMP 36 watt power supply for it.
When choosing the transformer, the wattage to choose depends on how many pieces light strips it power.And when choosing the transformer, we suggest to use a bigger wattage transformer than the strip rated power to  avoid full load working of the transformer. And a big power transformer do no harm to the strip but good for safty. 

And a big power transformer do no harm to the strip but good for safty. 
 
Below please find the connection diagram for Single Color Light Strip for reference.Direct Powered by Transformer Run to AC Wall Outlet, On/Off controlled by a Wall Switch

 

Light strip On/Off/Brightness is controlled by  Dimmer (Wireless or Hardwire Type available)

#1 Typical connection for one Dimmer to control one string of light bars

#2 One Dimmer to control several strings of light bars by adding Amplifier, and powered by one or several transformers. Note: The strips the Dimmer and Amplifer loaded with cannot exceed their rated max value. And in theory, you can add endless Amplifiers after the Dimmer.

 

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