DIY LEDs - The write-up
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pelochas
Member
Heatsinks, where to buy locally in houston, tx area? Or is online cheaper or better?
Trying to build my led light project, need two sections of 12" x 24". I
Want to add as much leds as possible in that area to get comparable MH lighting.
I have a two pieces of flat aluminum about 1/8" inch thick but dont know if there good enough to dissipate the heat. I see lots other diy builds using simple u channel aluminum purchased at lowes or hd.
I have my diy led drivers, yet im just procrastinating on the number of led lights and heatsink to use!!!
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Trying to build my led light project, need two sections of 12" x 24". I
Want to add as much leds as possible in that area to get comparable MH lighting.
I have a two pieces of flat aluminum about 1/8" inch thick but dont know if there good enough to dissipate the heat. I see lots other diy builds using simple u channel aluminum purchased at lowes or hd.
I have my diy led drivers, yet im just procrastinating on the number of led lights and heatsink to use!!!
Sent from my iPhone using Tapatalk
tonythefish
New member
I have mine 1 1/2 " spacing with optics
TheFishMan65
New member
I don't think you can do that on flat aluminum sheet. It also sounds like a lot of LEDs for that area. 24-36 LEDs are usually good for a 24x24 inch area.
TheFishMan65
New member
Well maybe if you run them low enough, that might also explain why you have so many.
miwoodar
Likey the bikey
I'm interested in knowing if 1/2" tall would be enough as well.
The Grim Reefer
Ready for some NOBALL!!!
I used 2x1 U channel and it's fine. Not really sure if the smaller stuff would have enough mass unless you use a lot of fans. I use 2 just to be safe.
ReefEnabler
Premium Member
Guys guys, long time no see!
I am moving next month; sold my tank already, sadly won't have a tank for a while!!
Sensing this upcoming "dry spell", I cannot seem to stop craving another project. Been wanting to get into hydroponic gardening for a while now (done some dabbling in peppers already). So I want to turn the garage of my next house into an Aeroponic grow room! (turns out my RO booster pump is the perfect misting pump also!)
First let me say that most of the gardening forums are a SAD sight when it comes to LED info, dear lord. People start a thread asking if LEDs are good... 3 posts say to get a UFO they're great (lol!!), then three more posts of people saying it can't be done and its too expensive. Then I post some real quick info and stats on a DIY LED rig that BLOWS all the commercial fixtures they are discussing out of the water... and they call me a shilll?!?! lolz!
So annnnnnnyways. I think we all here know that LEDs lighting up a small hydro growspace is really no problem at all.
The best way that I can find to do this would be to use the Meanwell 185-48B (or maybe the bigger 240, but probably not necessary).
My idea would be to run the driver at 3 amps and run 8 parellel strings of 12 LEDs (most likely XPGs, but whatever is cheap on DE when I decide to go forward).
So each LED would be running at 0.375ma, close to optimal. I want to run them low power for Eff and also because I don't want any cooling on the actual aluminum channel. I'd rather avoid potential issues where parts of the frame are cold, parts are warm, and as a result the Vf's drift much more than if you had just let the whole thing reach a nice and even temperature. I'm just guessing this would help the parallel strings based off things I've gleaned reading here. But please tell me if I'm wrong
So I am thinking of putting the 1ohm resistors for monitoring, as well as probably 0.7ma or 1a fuses. Haven't looked into these yet, but the idea would be to allow one or several strings to fail before fuses go, hopefully giving me a chance to see the problem (Thanks Kcress for this idea I read from you years ago).
How does my plan sound? Anybody have any suggestions? Tell me I'm a shill? lol
I am moving next month; sold my tank already, sadly won't have a tank for a while!!
Sensing this upcoming "dry spell", I cannot seem to stop craving another project. Been wanting to get into hydroponic gardening for a while now (done some dabbling in peppers already). So I want to turn the garage of my next house into an Aeroponic grow room! (turns out my RO booster pump is the perfect misting pump also!)
First let me say that most of the gardening forums are a SAD sight when it comes to LED info, dear lord. People start a thread asking if LEDs are good... 3 posts say to get a UFO they're great (lol!!), then three more posts of people saying it can't be done and its too expensive. Then I post some real quick info and stats on a DIY LED rig that BLOWS all the commercial fixtures they are discussing out of the water... and they call me a shilll?!?! lolz!
So annnnnnnyways. I think we all here know that LEDs lighting up a small hydro growspace is really no problem at all.
The best way that I can find to do this would be to use the Meanwell 185-48B (or maybe the bigger 240, but probably not necessary).
My idea would be to run the driver at 3 amps and run 8 parellel strings of 12 LEDs (most likely XPGs, but whatever is cheap on DE when I decide to go forward).
So each LED would be running at 0.375ma, close to optimal. I want to run them low power for Eff and also because I don't want any cooling on the actual aluminum channel. I'd rather avoid potential issues where parts of the frame are cold, parts are warm, and as a result the Vf's drift much more than if you had just let the whole thing reach a nice and even temperature. I'm just guessing this would help the parallel strings based off things I've gleaned reading here. But please tell me if I'm wrong
So I am thinking of putting the 1ohm resistors for monitoring, as well as probably 0.7ma or 1a fuses. Haven't looked into these yet, but the idea would be to allow one or several strings to fail before fuses go, hopefully giving me a chance to see the problem (Thanks Kcress for this idea I read from you years ago).
How does my plan sound? Anybody have any suggestions? Tell me I'm a shill? lol
TheFishMan65
New member
It will never work LEDs won't grow plants (coral either).
I don't see anything wrong with the plan. Except that you may want 13-14 (more?) LEDs. I don't recall the Vf at .375 amps, but at 3.4 volts per LED than 48 volts might run 14 LEDs. I think you know how to figure this out (if not post back).
I don't see anything wrong with the plan. Except that you may want 13-14 (more?) LEDs. I don't recall the Vf at .375 amps, but at 3.4 volts per LED than 48 volts might run 14 LEDs. I think you know how to figure this out (if not post back).
ReefEnabler
Premium Member
Thanks for the reply,
yea I can maximize the strings no problem. I just threw 12 out there since it was close. Not sure yet if I will end up with XREs or XPGs or maybe something else. so the Vf isn't known yet (but I know they're all around the same 3.somethin).
I'm also wondering to what extent I should try to 'manually balance' the Vfs. I was thinking of getting a Xitanium wired up wired up with some aligators and disconnects... so I can plug in my LEDs one at a time and make my own "Vf Bins", down to 0.1v or so.
Then I guess I would try to make the Total Vfs of each string be as close as possible.
I've never done that before on such a large scale.
Is it really important to use the same current as my planned current for the intial tests? Ie... do I need to test Vf at .375, or will the results be just as good if I test the LEDs at 0.7a instead? just asking because it will be easier (but rather trivial I guess to do it right).
I'm planning on the HLG 48B model since it has the same dimming interface as the ELN 60-48D (0-10v, at least I think its the same thing as the ELN).
I'd use one Pot to set the max current at .375, and then another pot to control them from cuttoff to .375 (maybe they'll go as low as 0.1a?). The reason is because I will be using tight optics and mounting the LEDs on the ceiling (anybody recall my Wife's ELOS build where we did this?). I know firsthand that it only takes a single LED with tight optics to potentially burn seedling plant tissue (and corals). So dimming is the obvious solution.
*edit* oh yea and in that other gardening forum, some folks eventually did come to my defense and I think I got my point across. So just gotta keep educating people about the big variations out there.
yea I can maximize the strings no problem. I just threw 12 out there since it was close. Not sure yet if I will end up with XREs or XPGs or maybe something else. so the Vf isn't known yet (but I know they're all around the same 3.somethin).
I'm also wondering to what extent I should try to 'manually balance' the Vfs. I was thinking of getting a Xitanium wired up wired up with some aligators and disconnects... so I can plug in my LEDs one at a time and make my own "Vf Bins", down to 0.1v or so.
Then I guess I would try to make the Total Vfs of each string be as close as possible.
I've never done that before on such a large scale.
Is it really important to use the same current as my planned current for the intial tests? Ie... do I need to test Vf at .375, or will the results be just as good if I test the LEDs at 0.7a instead? just asking because it will be easier (but rather trivial I guess to do it right).
I'm planning on the HLG 48B model since it has the same dimming interface as the ELN 60-48D (0-10v, at least I think its the same thing as the ELN).
I'd use one Pot to set the max current at .375, and then another pot to control them from cuttoff to .375 (maybe they'll go as low as 0.1a?). The reason is because I will be using tight optics and mounting the LEDs on the ceiling (anybody recall my Wife's ELOS build where we did this?). I know firsthand that it only takes a single LED with tight optics to potentially burn seedling plant tissue (and corals). So dimming is the obvious solution.
*edit* oh yea and in that other gardening forum, some folks eventually did come to my defense and I think I got my point across. So just gotta keep educating people about the big variations out there.
Last edited:
kcress
New member
Dear Shilly, Where are you moving to?
Also, if running plants.. I'd definitely go with the "budget build"! It's biggest detraction is lack of dimming. Plants don't need any stink'in dimmen. Get your hands on a nice supply, preferably a PFC job. Remember DWZM got some nice ones off epay.
Then line up your LEDs until they're only about a volt shy of your supply voltage and use the adjustable resistor to dial in the string. That will allow you to run any drive you want on individual strings. They also won't care what the next string is doing. Efficiency should exceed a driver. When you come to your senses you'll be able to up the current easily just by adjusting the resistor slider.
Also, if running plants.. I'd definitely go with the "budget build"! It's biggest detraction is lack of dimming. Plants don't need any stink'in dimmen. Get your hands on a nice supply, preferably a PFC job. Remember DWZM got some nice ones off epay.
Then line up your LEDs until they're only about a volt shy of your supply voltage and use the adjustable resistor to dial in the string. That will allow you to run any drive you want on individual strings. They also won't care what the next string is doing. Efficiency should exceed a driver. When you come to your senses you'll be able to up the current easily just by adjusting the resistor slider.
ReefEnabler
Premium Member
Thanks for the suggestion. I will certainly read more into using resistors instead.
I will have to look into that, since I'm not sure what kind of adjustable resistor you mean (a pot, rheo, or did you literally mean just swapping out a variety of different sized resistors?)
You still end up needing to drive a few strings in parallel, since the drivers are not super-high-voltage, right? Why exactly do the strings "not care what the next string is doing", like they do when you run parallel strings on a constant current driver?
I am only moving about a mile away, from Cary to Raleigh. Why? Well for one, my HOA and nosy neighbors basically are driving me out of my current house. Lots of absurd drama been going on and I have no desire be a part of it. No more bossy HOAs for me!
For one, a big tree in my backyard started falling apart about 3 days before hurricane Irene. My 3 yr old daughter was playing under the tree, the limb smacked her on the head and momentarily held her underwater in a kiddie pool. This was a VERY traumatic day for us as we were in the hospital etc, but everybody is just fine.
Had an arborist take a look and he said the tree might come down in the hurricane, and looked sick. We got a quick "OK" from the HOA over the phone to cut down the rest of said tree before Irene (normally you have to ask in writing and give them 30 days to reply). Well, the next day, THREE HOA board members trespassed into my yard, formed a chain and would not let the tree crew work, even when I said in no uncertain terms "Get off my property you are tresspassing". Had to call the Police. The HOA guys had the balls to insist to the police that they had bylaws granting them the right to tresspass. They even said that maintaining the communities tree cover was more important than my daughters injury.
I about lost it, almost took them to court over it. After things calmed down, decided what a good way to make even more enemies, better to just move. And that's only ONE of the crazy over the top things that happened to us in this neighborhood recently.
I will have to look into that, since I'm not sure what kind of adjustable resistor you mean (a pot, rheo, or did you literally mean just swapping out a variety of different sized resistors?)
You still end up needing to drive a few strings in parallel, since the drivers are not super-high-voltage, right? Why exactly do the strings "not care what the next string is doing", like they do when you run parallel strings on a constant current driver?
I am only moving about a mile away, from Cary to Raleigh. Why? Well for one, my HOA and nosy neighbors basically are driving me out of my current house. Lots of absurd drama been going on and I have no desire be a part of it. No more bossy HOAs for me!
For one, a big tree in my backyard started falling apart about 3 days before hurricane Irene. My 3 yr old daughter was playing under the tree, the limb smacked her on the head and momentarily held her underwater in a kiddie pool. This was a VERY traumatic day for us as we were in the hospital etc, but everybody is just fine.
Had an arborist take a look and he said the tree might come down in the hurricane, and looked sick. We got a quick "OK" from the HOA over the phone to cut down the rest of said tree before Irene (normally you have to ask in writing and give them 30 days to reply). Well, the next day, THREE HOA board members trespassed into my yard, formed a chain and would not let the tree crew work, even when I said in no uncertain terms "Get off my property you are tresspassing". Had to call the Police. The HOA guys had the balls to insist to the police that they had bylaws granting them the right to tresspass. They even said that maintaining the communities tree cover was more important than my daughters injury.
I about lost it, almost took them to court over it. After things calmed down, decided what a good way to make even more enemies, better to just move. And that's only ONE of the crazy over the top things that happened to us in this neighborhood recently.
ReefEnabler
Premium Member
Ok I found a budget LED thread by Kcress, so I will make sure I read through it before making him answer the questions which are most likely already answered in there
http://www.reefcentral.com/forums/showthread.php?t=1751598
thanks again
http://www.reefcentral.com/forums/showthread.php?t=1751598
thanks again
kcress
New member
OK good you found it. I was just about to go hunting. It's all in the first page. Then the thread goes off the rails as someone starts asking out epay light engines etc.
Yikes that tree episode was nasty. I'd move too. No way in h3ll I'd ever live in a HOA. They absolutely suck. I have a rental in one and it causes more headaches than any other aspect.
Yikes that tree episode was nasty. I'd move too. No way in h3ll I'd ever live in a HOA. They absolutely suck. I have a rental in one and it causes more headaches than any other aspect.
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