Diy led

looking at adding these to my 24 gallon nano was curious what color combination would you guys suggest.. im thinking 20 leds would be enought 10 18k and 10 blue
 
brassmonkyballs said:
Here's a great find which shows what I was explaining above. I was amazed to find something this useful and in video no less. This should give everyone a real good idea of the difference between Constant Current and Constant voltage as well as the difference a heatsink makes. Its 7 minutes long but please watch it.

http://www.youtube.com/watch?v=sEupSfzEIXM
Click to expand...
Seems you're right on the money.
Apperently it is a constant power supply (whatever that may be)
 
GUILLO1 said:
My 200 watt fedy driver just got fried today. It was working fine yesterday and today it would not turn on. I swapped it out with a new back up one I had and my LEDs are back on. My friend said that we are really pushing those drivers with so many LEDs. It lasted me like a month cuase I got it going on March 10. I guess we get what we pay for. Has anyone else had any problems with the fedy drivers?

Since I need to make some changes on my fixture anyways I guess I'll just have to go with some real Meanwell drivers.
Click to expand...

How many Leds where you running when the driver fried? What kind of heat-sink?
 
josephv said:
How many on each leg?
Click to expand...

I can't answer for GUILLO1, but at some point FEDY changed the driver configuration from two outputs to only one output. I'm not sure how/if this changed output voltage and current. This may be why everyone's experiences are varying so widely. My experience/testing is only with the single output driver.
 
reefrubble said:
If you put more LEDs in a string , won't that work the power supply harder ?
Click to expand...

Not with a constant VOLTAGE driver....it drops the voltage to each LED because V is locked in and current adjusts according to load and since V is down load is down so current drops too. Total output is 36V...divide that by number of LEDs...if its 10 then its 3.6V, if its 11 then its ~3.3V, etc

Constant CURRENT drivers are best a better choice for a variety of reasons.
 
bucks448 said:
I can't answer for GUILLO1, but at some point FEDY changed the driver configuration from two outputs to only one output. I'm not sure how/if this changed output voltage and current. This may be why everyone's experiences are varying so widely. My experience/testing is only with the single output driver.
Click to expand...

So you have a large power supply with 1 output that drives 80 3 w leds?I have not seen that.Interesting.I know the small power supply have 1 outlet that drives 30 3 w leds.
 
brassmonkyballs said:
Not with a constant VOLTAGE driver....it drops the voltage to each LED because V is locked in and current adjusts according to load and since V is down load is down so current drops too. Total output is 36V...divide that by number of LEDs...if its 10 then its 3.6V, if its 11 then its ~3.3V, etc

Constant CURRENT drivers are best a better choice for a variety of reasons.
Click to expand...

Then should we use 11 or 12 in each leg to be safe?
 
josephv said:
So you have a large power supply with 1 output that drives 80 3 w leds?I have not seen that.Interesting.I know the small power supply have 1 outlet that drives 30 3 w leds.
Click to expand...

Yes, I have the 200W driver and it only has 1 output. IMO running 80 (10 in series, 8 in parallel) 3w Fedy LEDs off the single output 200W Fedy is asking for a failure. The earlier design of the 200W Fedy driver with two outputs may be different. I would test it with a multimeter, so you know what you're dealing with.
 
ALL OF YOU GUYS SUCK!

I want LED's so bad...DAMN IT!

I just brought an ATI 36'' Powermodule! FML!

Roughtly how much would a build cost me for a simple 45 gallon tank (36Lx18Wx16H)?
 
josephv said:
Then should we use 11 or 12 in each leg to be safe?
Click to expand...

A cc driver regulates the current by changing its voltage.
I wouldn''t squeeze all the juice out of the driver by using up the voltage.
Unless there is a max voltage like the MW 60-48 which has an adjustable max of 52.8V, it's better to leave some headroom.
 
Jimmy54 said:
A cc driver regulates the current by changing its voltage.
I wouldn''t squeeze all the juice out of the driver by using up the voltage.
Unless there is a max voltage like the MW 60-48 which has an adjustable max of 52.8V, it's better to leave some headroom.
Click to expand...

I think he's referring to the FEDY drivers which we seem to have established are CV and not CC.
 
josephv said:
Then should we use 11 or 12 in each leg to be safe?
Click to expand...

Well depends on what you're seeing on your driver. maybe you have a different version FEDY? Sounds like it to me. Does the case give any info? Does it say Constant Voltage on it? Constant Current?

If its a constant voltage driver 10 in a series will put 3.6V across each led and current will ramp up to meet the demand...and i don't know what that might be. Using a meanwell driven at 700mA the voltage drop across my FEDYs was 3.45v. So I suspect at 3.6V you might be driving them at 800mA...but the meanwell is a constant CURRENT driver so who knows.

If the FEDY is CV then nothing will probably turn on with 12 in series and 11 is probably max and you'll probably only get 400mA at 3.27V.

If the FEDY you have is CC then 10 in series is fine as a CC driver will adjust voltage to maintain the drive current.
 
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