Choosing a Cheap Power Supply for Mean Well LDD-1000HW dimmable driver

BlennytheWise · 06/21/2014, 08:28 PM

I'm working on DIY LED setup and want to be able to control it using my arduino uno. Rapid LEDs recommended I go with the LDD Drivers for this and suggested I find a power supply.

The setup is:

2 x 5w and 4 X 3w LEDs and using the Mean Well LDD-1000HW dimmable driver.

So my questions are:

-would a 24V 24W 1A power supply be adequate/appropriate? I found that on Ebay for $19.00 as opposed to the $50.00 Mean Well SE-350-48.
-how do I figure out the correct amount of watts, volts and amps for my setup?

BlennytheWise · 06/22/2014, 05:43 AM

or this: AC 110/220V DC 24V 5A 120W Switching Power Supply Adapter

Holokai · 07/03/2014, 06:34 PM

Starting the same (almost exact) project. I'll just sit here and wait for an answer.

saf1 · 07/04/2014, 10:54 AM

I'm actually ordering two of their Borealis Luxeon array's later today. Along with that will be 4 x Mean Well LDD-700HW dimmables and 4 x Mean Well LDD-1000HW dimmables. For power I'll be using their Mean Well SE - 350-48 for power.

I've had knock offs of that same power source and the internal fan is super cheap. I've replaced two fans so far and one power supply due to it blowing a few capacitors when it failed and over heated. I only bring this up because you said "choosing a cheap" power supply in the title. Some things you want to spend a little bit of extra money on just for the safety net. Mean Wells are just that, built to last. I've never had one fail.

mcgyvr · 07/04/2014, 02:12 PM

check out mpja.com they have tons of low cost power supplies.

what are the forward voltage ratings of the LEDs you want to use and how do you plan to wire them.. that will determine what voltage power supply you need.

perkint · 07/04/2014, 04:29 PM

For each LED string, add together the fV of each LED on it (eg 4x3W LEDs with a fV of 3V each would be 12V), add 3V for the LDD, and then multiply that by the drive current you intend to use. This gives you the wattage of that string. Add all the wattages for any string you are running off the power supply. That gives you the minimum wattage you need (I'd go for between 10 & 50% more than you need - most power supplies don't like being run flat out). And the minimum voltage of your power supply is that of the highest voltage string (including the 3V for the LDD).

Running a voltage supply is not too much of an issue, but is less efficient (the LDD can drop the voltage to whatever is required, within eason).

Hope that helps and makes sense!

Tim

06/21/2014, 08:28 PM	#1
BlennytheWise Registered Member Join Date: Nov 2013 Posts: 30	Choosing a Cheap Power Supply for Mean Well LDD-1000HW dimmable driver I'm working on DIY LED setup and want to be able to control it using my arduino uno. Rapid LEDs recommended I go with the LDD Drivers for this and suggested I find a power supply. The setup is: 2 x 5w and 4 X 3w LEDs and using the Mean Well LDD-1000HW dimmable driver. So my questions are: -would a 24V 24W 1A power supply be adequate/appropriate? I found that on Ebay for $19.00 as opposed to the $50.00 Mean Well SE-350-48. -how do I figure out the correct amount of watts, volts and amps for my setup? Last edited by BlennytheWise; 06/21/2014 at 09:21 PM.

07/03/2014, 06:34 PM	#3
Holokai DIY Lite Join Date: Oct 2003 Posts: 666	Starting the same (almost exact) project. I'll just sit here and wait for an answer. __________________ The weather is here, wish you were beautiful...

07/04/2014, 10:54 AM	#4
saf1 Registered Member Join Date: Aug 2001 Location: California Posts: 2,259	I'm actually ordering two of their Borealis Luxeon array's later today. Along with that will be 4 x Mean Well LDD-700HW dimmables and 4 x Mean Well LDD-1000HW dimmables. For power I'll be using their Mean Well SE - 350-48 for power. I've had knock offs of that same power source and the internal fan is super cheap. I've replaced two fans so far and one power supply due to it blowing a few capacitors when it failed and over heated. I only bring this up because you said "choosing a cheap" power supply in the title. Some things you want to spend a little bit of extra money on just for the safety net. Mean Wells are just that, built to last. I've never had one fail. __________________ -saf1 Current Tank Info: 210 gallon mixed reef

07/04/2014, 02:12 PM	#5
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	check out mpja.com they have tons of low cost power supplies. what are the forward voltage ratings of the LEDs you want to use and how do you plan to wire them.. that will determine what voltage power supply you need. __________________ Who me?

06/22/2014, 05:43 AM	#2
BlennytheWise Registered Member Join Date: Nov 2013 Posts: 30	or this: AC 110/220V DC 24V 5A 120W Switching Power Supply Adapter

07/04/2014, 04:29 PM	#6
perkint Registered Member Join Date: Jan 2014 Location: Robin hood country, UK Posts: 817	For each LED string, add together the fV of each LED on it (eg 4x3W LEDs with a fV of 3V each would be 12V), add 3V for the LDD, and then multiply that by the drive current you intend to use. This gives you the wattage of that string. Add all the wattages for any string you are running off the power supply. That gives you the minimum wattage you need (I'd go for between 10 & 50% more than you need - most power supplies don't like being run flat out). And the minimum voltage of your power supply is that of the highest voltage string (including the 3V for the LDD). Running a voltage supply is not too much of an issue, but is less efficient (the LDD can drop the voltage to whatever is required, within eason). Hope that helps and makes sense! Tim