HOW TO SELECT APPROPRIATE TRANSFORMER FOR 12V LED STRIPS

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

–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.

NOTE: This method the data get is rated power consumption.

In real, once the strip be made into a long run, there is voltage drop, which will cause the lost of the power.

The long the strip, the less real power it produce. A 5meter long strip compare to a 1meter strip, same model, the real power will be 40%-50% less.

The shorter the strip, the real power will much closer to its rated.

And again, some maker will use different resistors to adjust the strip output wattage. For example, if the LED component rated is 60mA, to get better lifespan, will use a big resistor, the current of LED will be used less than rated.

 

A:  Single Chip SMD3528    0.08watt / LED   

Note: Now the SMD3528 is replaced by the name SMD2835, 0.1W. 

The strip made with this 3528 LED, the models we sell online have:

SMD3528, 150LED per roll, Less Intensity Single Row LED Strip

SMD3528, 300LED per roll, Medium Intensity Single Row LED Strip

SMD3528, 600LED per roll, High Intensity Single Row LED Strip

SMD3528, 1200LED per roll, Double row LED Strip

 

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=2.54cm.

 

B:  Single Chip SMD2835    0.2watt / LED   

The strip made with this LED, the models we sell online have:

SMD2835, 300LED per roll, Less Intensity Single Row LED Strip

SMD2835, 600LED per roll, High Intensity Single Row LED Strip

SMD2835, 1200LED per roll, Dual Row LED Strip

 

Strip Model

2835,300LED/Roll

2835,600LED/Roll

2835,1200LED/Roll

 

60LED/Meter

120LED/Meter

240LED/Meter

500cm

60Watt

120Watt

240Watt

300cm

36Watt

72Watt

144Watt

200cm

24Watt

48Watt

96Watt

100cm

12Watt

24Watt

48Watt

50cm

6Watt

12Watt

24Watt

1feet(30cm)

3.6Watt

7.2Watt

14.4Watt

 

B:  Side viewing SMD335    0.08watt / LED         

The strip made with this 335 LED, the models we sell online have:

SMD335, 300LED per roll, Medium Intensity Single Row LED Strip

SMD335, 600LED per roll, High intensity Single Row LED Strip

 

Strip Model

335,300LED/Roll

335,600LED/Roll

 

 

 

60LED/Meter

120LED/Meter

 

 

500cm

24Watt

48Watt

 

 

300cm

14.4Watt

28.8Watt

 

 

200cm

9.6Watt

19.2Watt

 

 

100cm

4.8Watt

9.6Watt

 

 

50cm

2.4Watt

4.8Watt

 

 

1feet(30cm)

1.6Watt

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         

The strip made with this 5050 LED, the models we sell online have:

SMD5050, 150LED per roll, Less Intensity Single Row LED Strip

SMD5050, 300LED per roll, Medium intensity Single Row LED Strip

 

Strip Model

5050,150LED/Roll

5050,300LED/Roll

5050,600LED/Roll

 

 

30LED/Meter

60LED/Meter

120LED/Meter

 

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

          A:    Non-waterproof transformer, DC12V,  from 1AMP(12watt) to 8AMP(96watt)

         B:  Non-waterproof Heavy Duty Industrial Series Adapter,  DC12V, from 8.5AMP(102watt) to 30AMP (360watt)
 

         C: Waterproof LED transformer,  DC12V, from 2.5AMP(30watt) to 8.3AMP(100watt)

 

Step 3: Select the right AMP

         A: 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(30watt)

        B:  if you ordered 2 reel SMD5050 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)

 

 

PS: The AMPs or Wattage of the power supply must higher than the actual power consumption,  e.g. for one reel SMD3528 led strip with 300 LEDs, the power consumption is 24watt, but we recommend you choose DC12V  3AMP  36watt power supply for it.

If you have any problem, please contact us!

 

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