Wiring Diagrams

Need a little help wiring or getting something connected check our Wiring Diagrams?



This is our standard wiring configuration. With a forward voltage just over 3.2v we recommend 6-12 CREE X P/R-E LEDs. Make sure your driver does not exceed 1000mA when driving the XR-E. The Cree X P/R-E LED is rated for up to 1000mA but we found around 700-800mA ideal as the PAR/Amps are not linear. If you up the current 10% over 700mA you will not get 10% more light. The Mean Well LPC 35-700 works well with this configuration.

This configuration works well with the Mean Well ELN 60-48 and our CREE XP-G Cool White LEDs.


This our preferred wiring for the dimmable Mean Well ELN 60-48 series of drivers. At 1.2 Amps this driver will overdrive your CREE X P/R-E LEDs when at full power in a single series. The solution is to run 2 parallel strings and essentially splitting the Amps. This will run two parallel strings of 12 at 600mA which is close to ideal for the CREE X P/R-E LED.



We recommend this wiring configuration for the Mean Well PLN 100-48 or when you want to drive your LEDs gentler with the Mean Well ELN 60-48.



We recommend this wiring configuration for the Mean Well CLG 150-48A or the Mean Well PLN 100-48 or when you want to drive your LEDs gentler. The CLG 150-48A is rated fro 3.2A so you will might want to dial down the driver to keep the current at or less than our recommended 700mA or add a fifth string if 12 LEDs. The XR-E is rated at 1000mA max current but to ensure longevity and safety in case one string becomes open we recommend driving the Cree XR-E at 700-800mA in this configuration.

Whenever you use a driver with a current over 1000mA its always a good idea yo use a 1 amp quick blow fuse in series with each string of 12 LEDS. Also ensure your driver is unplugged when connecting it to your LEDs. Failure to do so my damage your LEDs

Note: These Diagrams are a simple easy to understand artist rendition of an wiring schematic. We do not recommend mixing different types of LEDs in parallel strings. If you do mix Royal Blue with Cool White ensure both of the same type and from the same lot. Also ensure that the mix is evenly balanced (equal number of Royal Blue and Cool White in each string.) Adding a 1 Ohm resistor to each string will also help you monitor the current through each string. The voltage at 1 Ohm is your current…Ohms Law I=V/R.




Using Resistors and Fuses in Parallel Strings Wiring Diagrams

We highly recommend using 1000mA fuses when employing parallel strings. The use of resistors is primarily used for monitoring current through a parallel string of LEDs


Ohms law is rather simple V=I/R or Volts=Amps/Resistance. In our application we use a 5 watt 1 Ohm resistor to easily measure current. With the resistor in series to your LEDs all you have to do is measure the voltage across the resistor and that will give you your current. For example in the video we measured .55 volts across the resistor and using Ohms Law this is equal to 550mA. On a surprising note the Mean Well ELN 60-48D gave us .85 volts at 9VDC control which is 850mA on one string which is well above their 1.2A output rating when divided by two parallel strings of LEDs.

The use of fuses is primarily for insurance. In our listed circuit the Mean Well 60-48D is putting out a measured 850mA per string. If one LED fails open or an open happens in a solder joint 850mA x 2 or 1700mA will rush through the other string of LEDs causing damage in seconds. If you have a 1000mA fuse this will blow saving you LEDs.

Over all the cost of fuses and resistors is cheap and given the benefits we highly recommend them when using parallel strings of LEDs.



Example setups

Dimming Setup Wiring Diagrams

If you have a full apex the PM1 module has the dimming ports built into it.


Connecting the dimming control of multiple drivers together


Apex Setup Wiring Diagrams

2 thoughts on “Wiring Diagrams

  1. Hi I’m looking into building my own led set up for my 120Gal reef tank. I’m an electrician so I have some knowledge however I’m trying to understand how and why you came up with the type of resistor? I am more industrial qualified so pardon my lack of knowledge on the resistor. Any help would be greatly appreciated. Thanks

    1. The resistance on a factory LED Circuit Board is rather constant.

      The Resistance of a parallel circuit using the BJB Solderless Connectors may change over time due to corrosion… Some do not protect their fixture from salt spray or creep.

      The Resistance of an individually soldered LED String can vary based on ones soldering ability.

      The only reason for the 1 ohm resistor is to easily measure voltage drop. Using Ohms Law V=I/R you can determine and monitor the current in parallel strings tied to a single driver.

      Using a resistor in series with LEDs is not necessary for a single string.

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