LED Group buy!

Definitely wrong.

Anyone have any extra whites? I tried 7 LEDs in a series, and fried at least one. Gotta hook up two AA batteries and see if I can find the blown LED(s).

Edit - Just finished testing. I have one blown white LED, so if anyone has an extra, I'd appreciate it....

Thanks.
 

QLe

Turbo Snail
If anyone order more white in the future, I suggest going with the 20,000 Kelvin to 25,000Kelvin light. The 10,0000 seem kind of warm to me.
 

Zooid

Reef Shark
M.A.S.C Club Member
damn you guys are going to force me to buy a big resistor just to test my drivers! I'd rather not blow any LED's since the shipping is outrageous hehe.
 

that0neguy1126

Registered Users
M.A.S.C Club Member
Lol, gale. The 60W ones are good. Plus you can hook it up and test it without putting LED's on it since its constant current it doesn't need a load.
 
Derek,

I ended up with 25 extra lenses in the bag you gave me. When we figure out what is going on with the 30W drivers, I'll get the extra lenses back to you.

I'm all wired up now, waiting on drivers :)

It's not very pretty (I ran three separate circuits for white, super blue, and blue, so the LEDs were staggered on the heatsink), but I think it'll all work when the right drivers show up.

The LED missing the lens is my blown white LED. :(

 

Zooid

Reef Shark
M.A.S.C Club Member
Derek, have you tried running 10 LED's on the 60W driver?
It looks like the tag says a minimum of 12 but the low end of the voltage is 30V. Since the voltage drop of each LED is 3.6V, it seems
like we should be able to drive 10 LEDs with this driver...yes/no?
 
I've been looking around the house for something I could use to fire up my LEDs. I found a 24V DC Power Supply, but the current is non-regulated. It will go up to 6 amps. Do I need to do something to limit the current so I won't blow out any more LEDs?
 

that0neguy1126

Registered Users
M.A.S.C Club Member
I hooked up 12 minimum and it worked fine. Not sure how acurate the labels are, or the tollerances, I only bought 1 60W to playa round with and use as a fuge light.
 
hooked;83785 said:
Here is a link with a calculator for just putting a resistor in series with your LEDs. I've used it before and it is good.

http://led.linear1.org/led.wiz
Doyle,

Thanks for the link. Looks like I just need to put a 1 ohm resistor in series with each bank of 10 LEDs and I should be fine. It will only run each LED at 2.4V but that will be fine until I can get the drivers changed out.
 

that0neguy1126

Registered Users
M.A.S.C Club Member
I have been talking with Felix trying to work something out. The problem is, he sent us what we ordered. They do not make a 30w driver at 750mA. I think the one everyone meant to order was the 36w which is driven at 750mA.

I tried to see if we could exchange them, I told felix I would pay for shipping, but it is more to ship them both ways than it is to order new ones.

He said the 30w will work if you use 18 3w LEDs, they will just be under driven (think of it like dimming to 50%), which is what a lot of people are doing anyway. Dan correct me if I am wrong, but aren't yours at 50% power right now?

I am not sure what to do at this point, Still trying to work something out with Felix though.
 

that0neguy1126

Registered Users
M.A.S.C Club Member
ZenMan;83776 said:
I've been looking around the house for something I could use to fire up my LEDs. I found a 24V DC Power Supply, but the current is non-regulated. It will go up to 6 amps. Do I need to do something to limit the current so I won't blow out any more LEDs?
a regular DC power supply (wall wart) will not work. 99% of things are Voltage driven, so the voltage stays the same, and the current changes based on load. LED's are the opposite, they need constant current to run, and the voltage changes.
 
Derek,

We went through a broker to make sure we wouldn't be left in the cold. What kind of crap is Felix spewing now. First he said the drivers just had the wrong label, now the label is correct, but the drivers are wrong for our use? I was following Dan's comments in another thread, and he did confirm with Felix that this driver was appropriate for our use. Additionally, we bought everything from a single supplier so there is the implied warranty of fitness for use. It's not like we ordered 1W LEDs, everything we ordered was 3W.

Make sure you indicate with AliExpress that there is a problem with our order so they won't release escrow.

I'm not willing to experiment with these 30W drivers any more. I say push back hard. It's not our error.
 
I just checked into shipping. All of these 30W drivers will fit in a medium priority mail flat rate box. $43.23. I know shipping rates from China to the US are at least 50% cheaper than that.
 

QLe

Turbo Snail
I fired up my LED and it is over the tank. I got to say, I'm not too impress with it at the moment. I got 18 white (9 10k and 9 20k), 18 Royal Blue, and 18 Blue, there seem to be a lot of shadow especially toward the front of the tank and it is darker than my metal halide. They are on at 100%, but still dark.
 

dv3

Beluga
M.A.S.C Club Member
how big is the tank?...you will have to play with different optics to find the best mix between par and shadowing ...IMO ....shadowing is a problem alot of people have with LED's ,even big name ones
 
QLe;83821 said:
I fired up my LED and it is over the tank. I got to say, I'm not too impress with it at the moment. I got 18 white (9 10k and 9 20k), 18 Royal Blue, and 18 Blue, there seem to be a lot of shadow especially toward the front of the tank and it is darker than my metal halide. They are on at 100%, but still dark.
Pictures?
 
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