Calculating output

[Jade5051]

I've done a few calculations of my own, based on US 120v circuit. None of my calculations are coming close to the 50w output that they claim.

Can someone please do a calculation and tell me what they get?

 

[Jade5051]

I think I figured it out. But, I still want to see what you guys get.

 

[stephenhall1987]

To what's are you referring?

 

[Jade5051]

Sorry, thought I had the link in there.

http://www.ebay.com/itm/22191795137...49&var=520809981869&ssPageName=STRK:MEBIDX:IT

 

[stephenhall1987]

Yeah it states in the picture that the output is 15 - 34v 1500mA

34v x 1.5A = 51 watts

in the description it states:

LED Driver (5-10)X5W For 50W High Power led bead and also for 5-10pcs T6/U2 led bead:

Input Voltage: AC 85V-265V, 50Hz/60Hz

Output Voltage: 15V-34VDC

Output Current: 1500mA ±5%

So it sounds like they intend this to be used with 5w leds. Most of the time we use 3w leds. Maybe some one else here could say if it would work with both?

 

[DrewHaus]

As the above poster said, they are referring to output power (the total current running through the LED's multiplied by the voltage they are being driven at). Power will vary depending on the voltage you run them at. For quick reference, you can calculate power a number of ways:

P = I*V
P = (V^2) / R
P = I^2 * R

I = current, V = voltage, R = resistance

 

[Jade5051]

Yeah it states in the picture that the output is 15 - 34v 1500mA

34v x 1.5A = 51 watts

in the description it states:



So it sounds like they intend this to be used with 5w leds. Most of the time we use 3w leds. Maybe some one else here could say if it would work with both?

I believe this will only put out 51 watts if you are driving it with 265v from the wall. My calculations estimated that the output would be around 30 watts on a 120v circuit.

 

[stephenhall1987]

It shouldn't matter what your input voltage is. The driver is a transformer that is going to change that voltage to the 14-34 volts. The 50 watt rating is for the output power. If you have it adjusted to full power, it will allow 1500 milliamps (1.5 amps) at 34 volts. 1.5A x 34V = 51 watts.

It states that it can handle an input voltage of 85 to 277 volts. So it can run in America or over seas. But the input power is unrealated to the power rating of a driver (transformer).

 

[Jade5051]

Half an amp can only carry 60 watts. After resistances and efficiencies you'll be under 50 watts.