LED's Not Running at Full Brightness

BoonDogs

I am self diagnosed with CLAP
Joined
Jan 7, 2016
Messages
122
Location
Sydney
Hi all,


I'm running some DC icicle lights through a 6 channel RGB controller at 24vdc (they originally ran at 24vdc too).
The problem is when I run them through the controller, they do not run at the same brightness that they ran at through the original power supply and multifunction controller.


I have attached some pictures below to try to explain better. Is it a possibility that the board is limiting the current flow or something similar? The data sheet for it claims 4amps per channel.


Thanks
 

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David_AVD

Bite my shiny metal ass!
Community project designer
Generous elf
Joined
Jun 12, 2010
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4,149
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Victoria Point (Brisbane)
The "24V light sets" usually use a 24V AC plugpack where as you're using a 24V DC power supply.

That 24V AC is rectified to produce a higher (but choppy) DC voltage.

To get the same brightness, you'll need to use a DC voltage in the range of 29V - 31V.

Personally I use 30V Mean Well power supplies to run my Big W strings with DC controllers.
 

i13

Senior elf
Joined
Jul 5, 2013
Messages
804
24V is too low so there isn't enough current to light the LEDs. It is the current, not the voltage that lights the LEDs.

To get the LEDs running at the right brightness, you need to calculate the current they should draw and then adjust their input voltage to get them to draw this amount of current. The Big W sets of 200 lights will draw 100mA per channel when your voltage is right. You can modify the light sets to get them running at the same voltage.
 
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