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# LED 3 Watt Testing Answered

I recently purchased 13- 3 watt LED's.  I'm trying to establish a high out put LED light.
I also purchased a LED Driver Transformer 48 Watt 120 Volt to 12v DC 4 Amp.

First I would like to test each LED using the same divider.

I'm thinking that if I create a voltage divider two 330 ohms to limit the current and reduce the voltage to about 6 volts that would allow me to test with the driver that I purchased.

Secondly, will this driver be enough to drive all my LED's and would I have to reduce the voltage down too since it appears to push out enough wattage and amperage for the total number LED's I'm putting together?

I'm building my circuit based on this video.

Assistance would be greatly appreciated.

Regards,

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## Discussions

I've since figured out my problem. What I did was create my own power supply and regulator. It was powerful enough to make all the 13 work in series. I can go one step further and add another 13 LED's in series.

Now looking back I could have made the circuit in parallel by putting 3 LED's in series in parallel with another set of 4 rows of 3 in series.

I meant to say I can go one step further and make another parallel circuit with another 13 LED's in series.

With the variable regulated circuit I can make the LED dim or bright depending on preference. No need for a clocking circuit.

I've been running the circuit for 3 months now with no problems.

Here is the link to the regulated kit I'm using.

http://engineeringshock.com/lm317-variable-power-supply-kit-diy-p-55.html

You need to connect the LEDs in parallel .... A series resistor in the range of 270 - 390 Ohms 1 watt for each LED will limit the current .
There is no need for another power supply as the one yougot will do without connecting the potential divider ...

LED Spec
http://ledsupply.com/indusstar-1up.php

I did measure the voltage on the LED Driver. It is a DC power supply with a regulated 12 volts. The reason for the voltage divider is to reduce the voltage on a single LED to for testing purposes.

I do realize now that for all these LED's to work in series I need a bigger power source. I haven't figured out the right size though. I have an old PC that I can gut out for the 200 watt power supply and it's regulated, so that might work?