diy LED Lumina 5.2 Purchase help.

[Idefixes]

i think I like option 2 and the idea of dialing them down.

So power supply 21 volts. but still has to be above 250 watts?

Standart power supply are 24V rated. With 21V on demand (LDD+Led) you don't have to do anything. For dailing led down you will have to do that with controler that you choose (storm or storm x it seems). For power supply you will need 3x4.1A=12.3A or 12.3x24V=295W with no marge in so IMO it's better to take a SMPS rated @ 350-400W for 3 LDD in parallel on SMPS

Marc

 

[perkint]

Three of the lumias run at the currents you are running is 210W. Four would be 280W. Add 10% for the LDDs (this is more than they use, but a bit of spare capacity doesn't hurt ) and then add a further 25% at least for a good margin to prevent running the PSU too hard. So you want a 24V at about 290W (or higher) for 3 or 385W (again, higher is OK) for 4.

I still think you'd actually be OK with 4 on the 360W i linked earlier, running 2 sets of 2 in parallel. But i would have to double check the LDD efficiencies at those voltages, but i bet you'd only actually be running at 300W or less (the main strings would be running at about 97% efficiency from the LDDs and the other strings are lower wattage so an increased use on the LDD has less impact overall). And I'd happily run 300W from a meanwell 360W PSU

Tim

 

[perkint]

i think I like option 2 and the idea of dialing them down.

So power supply 21 volts. but still has to be above 250 watts?

A 24V PSU would be fine, as Idefixes said, but if you do get one which is adjustable (a lot can be tweaked up or down about 10%) I'd turn it down a bit. You probably won't get it as low as 21V (and I'd keep it at about 22V anyway) but the LDDs are more efficient the nearer their input voltage is to what is required.

Doesn't make a world of difference efficiency wise as the LDDs are pretty good whatever (so i certainly wouldn't go looking for an adjustable PSU just to do this), but if your PSU can be adjusted, the only impact of doing it is things run a bit more efficiently (therefore cooler & cheaper), so why wouldn't you?

Tim

 

[banthonyb71]

ok. so the 350 watt 36/v mentioned above and then what about gwtting drivers cheaper like JediBen mentioned? his is a link to the led dimmer page but where are the dimmers I need on TRC site. I know where they are on LEDgroup buy site but he mentioned being a few $$ cheaper?

LDD are cheap, $3.70-5 from Allied electronics. TRC is a website, http://www.trcelectronics.com/

 

[banthonyb71]

also, could I use this to cool my multichip?

http://www.newegg.com/Product/Product.aspx?Item=N82E16835103195

 

[banthonyb71]

ok now I found the drivers on the site Jedimaster ben mentioned.

 

[banthonyb71]

since someone here linked me to a 36volt PS but then someone else said 36 volts isnt enough for een 2 lumias. as a newbie, I really have no idea who to listen to. do I listen to person a/ or person b? what about person g and h?

So I hope someone will tell me something and it can be confirmed by another member.. please!

So this is what I started to order.

except I need to get something else to go over $25 to avoid the handling fee.
So I thought about just getting PS from here. so is this enough to run 2 in parallel and later add a 3rd?

 

[Aqualund]

Okay I made a diagram for you to outline how to hook up the lumias in parallel.

 

[Aqualund]

Also as far as that cooling solution you posted. If it is anodized aluminum that is giving that copper color thats fine...but if it's copper I'd stay away from that. Also, it just seems like too expensive of a solution, as you would need one of those directly behind each puck to be effective.

But on the other hand, I have used these fans for about two years now with no issues. Get a couple of these above a decently thick and large aluminum heatsink and you'll be fine and save a lot of money.

http://www.digikey.com/product-detail/en/0/259-1461-ND

 

[banthonyb71]

ok cool. hey thanks alot Aqualund. I have plenty of those fans already. my reason for that cooling option is because I only have a couple inches of room behind the Puck to mount it on the rail on my fixture. So I will need either a really thin heatsink or something along the lines of what I showed.

So only thing I need now on confirmation on the last power supply I showed? zI dont know if its adjustable tho. or what to look for to know if its adjustable. thanks again

 

[Aqualund]

That power supply will do just fine btw.

And those fans...make sure the ones you have are brushless or fancy dancy bearings because the saltwater evap will break down most el cheapo fans in like a month. Obviously the ones i linked are pretty cheap but they really last long because of how they are built. I've tried like 5 other kinds...some more expensive that didnt work very well.

 

[perkint]

How are you going to wire the LEDs? If wiring all in parallel, the highest fV of any string is 18V. The LDD needs 3V, so you need a PSU which will give at least 21V (48V will do, but 21V is the most effecient). If wiring them with 2 in series, the highest fV becomes 36V. With 3V for the LDD that gives 39V and the 36V meanwell SE series can be adjusted to anywhere between 32.4 & 39.6V so will happily cover 2 in series.

In fact the 48V can be adjusted up to 52.8V so would even drive 3 in series, so you could, if you wished, drive three from one set of LDDs.

Tim

 

[banthonyb71]

I am starting out with just the two Lumia for now. So I will wire those two in parralel. later when I buy the third I will wire all 3 in series. with 48volt power supply

 

[Idefixes]

How are you going to wire the LEDs? If wiring all in parallel, the highest fV of any string is 18V. The LDD needs 3V, so you need a PSU which will give at least 21V (48V will do, but 21V is the most effecient). If wiring them with 2 in series, the highest fV becomes 36V. With 3V for the LDD that gives 39V and the 36V meanwell SE series can be adjusted to anywhere between 32.4 & 39.6V so will happily cover 2 in series.

In fact the 48V can be adjusted up to 52.8V so would even drive 3 in series, so you could, if you wished, drive three from one set of LDDs.

Tim

Hi tim,

LDD-H has 52V max output voltage so 3X18V=54V exceed this 52V, i would'nt wire three in serie on a LDD....

Marc

 

[banthonyb71]

Hi tim,

LDD-H has 52V max output voltage so 3X18V=54V exceed this 52V, i would'nt wire three in serie on a LDD....

Marc

So wire 2 in series and one by itself? what will be the voltage then off the power supply?

 

[perkint]

LDD-H has 52V max output voltage so 3X18V=54V exceed this 52V, i would'nt wire three in serie on a LDD....

Sorry - you are right Bad advice on my part there!

So wire 2 in series and one by itself? what will be the voltage then off the power supply?

2 in series needs 39V input so the 36V SE PSUs suggested earlier will do the job.

Tim

 

[oreo57]

So wire 2 in series and one by itself? what will be the voltage then off the power supply?

Personal opinion:
Just get 5 drivers for each chip.
Run 1,2,3 whatever in parallel..

A large 24V ps to match 3 chips watt output..

Reason being 1)1500mA Ldd's can only be found in Ldd-l's w/ lower voltage maximums..
2) Easier to match a power supply .. assume at most 5A per chip @24V (real power could be 1/2 this) 15A PS @ 24V
(quick calculation: 3.6A per chip)

A cheap one:
http://www.amazon.com/Switching-Power-Supply-Transformer-Regulated/dp/B006QSOF60
Not recommended but for reference

Get a bigger one and add a 4th someday..
http://www.banggood.com/Switching-P...=Led-bulb-us&gclid=CIrci_r8q8QCFQsFaQodhRIAmA

There is no need to run the whites and blues at 1500mA though. thought I'd throw that in.. 1000mA would be fine.

 

[banthonyb71]

So if you run them in parallel the wattage stays the same? but if ran in series its wattage x # of chips?

 

[oreo57]

So if you run them in parallel the wattage stays the same? but if ran in series its wattage x # of chips?

no the voltage stays the same.. the amp draw is additive...

w=VxA

Either way the watts increase as you add chips.

Minor point is lower voltage high watt power supplies are cheaper than higher voltage high watt power supplies.Generally speaking

I'm considering vendor to vendor not quality here

 

[banthonyb71]

also if channels 2 and 3 are 1500 mh, then why Im I only using a 1000mh driver?