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# Connecting 200 LEDs with LED Driver with best possible way to get a got output

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#### rakesh1987

##### Junior Member level 3
hello all,

I want to connect .18A ,3.1V LED (200Nos.) with a 150W, 1.75A LED Driver , which is the best way to connect?

Regards
Rakesh

So you already have a specific LED driver you intend to use? If so then its operating specifications will limit what kind of load you can use on it. Do you know its method of operation and specifications?

Looks as though, you need less then 10 strings of LEDs, with 10, the driver will have to supply 1.8 A which is too much. 9 would give you 9 X .18 = 1.72 A which is just enough. The trouble now is that 200/9 is not an integer, so you will need 8 strings with 25 LEDs in each. This will take 8 X .18 = 1.44 A. The total voltage drop per string will be 25 X 3.1 = 77.5 volts. You will need an additional voltage to maintain a constant current, say 10% so you need a supply voltage of 85V or so, with a resistor in each string to drop the excess voltage at the running current, Vdrop = 85 = 77.5 = 7.5V @.18 , R = 7.5/.18 = 42 ohms @ 2W.
Frank

Points: 2

### rakesh1987

Points: 2
with a 150W, 1.75A LED Driver
You didn't specified voltage of your driver.

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