Jimjim's new diy 'creeation'

jimjim2609

jimjim2609

Well-Known Member
lax123 said:
I dont quite get what u r saying about pos and neg....but (12v-25v) means u Need to have at least a Forward voltage of 12V, so like a Minimum of 4whites with like 3,2Vf or 6red with 2,3Vf. Otherwise the Driver wont be stable in Output and flashing occures.
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I just wanted to test the circuit of the leds, so the five on one side and the five on the other side were tested by hooking the 10w driver to the leds and they worked fine. The total Vf for each side (5 leds) is 17.5v

Bumping Spheda said:
http://electronics.stackexchange.com/questions/52999/why-is-my-constant-current-source-led-driver-pulsing

Wrong driver? Check the math again.
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Double checked. Each led requires 3.5v at 1.2A to produce 4w. So correct me if im wrong :- 10 (leds) x 3.5v = 35v. The driver output is DC:20-39v 1200mA -+ 5%. So from that i think it should be right. Is this correct?
 
L

lax123

Well-Known Member
What do you mean by "five on one side and five on the other side"? U did two attempts and tried individually 5 in series if they work? I
hooked up the driver for the crees, turned them on and all i get is 3 on the positive side and one on the negative side flashing
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So that means 6 in series or not?
Each led requires 3.5v at 1.2A to produce 4w. So correct me if im wrong :- 10 (leds) x 3.5v = 35v. The driver output is DC:20-39v 1200mA -+ 5%. So from that i think it should be right. Is this correct?
Click to expand...
Try with one led less, but i think it should be right even with 10, as Long as u dont exceed max wattage of the Driver. With the multimeter in series and switched to amps, (Switch to 10A fuse) you could check if the Output is really 1200mA, multimeter switched to voltage DC -on the Output of the Driver, in parallel to the circuit (one end on + one on -) you could check for the actuall voltages
 
jimjim2609

jimjim2609

Well-Known Member
lax123 said:
What do you mean by "five on one side and five on the other side"?
Click to expand...
If you have a look at the pic all 10 crees are in series but i disconnected the wire connecting them at one end so that only five were now wired in series. Thats what i mean by 5 on each side.
 
Bumping Spheda

Bumping Spheda

Well-Known Member
Idk, it sounds like you're overloading the driver, yet everything seems to match up. I'd contact the seller that you got the driver from and tell them your issue.
 
jimjim2609

jimjim2609

Well-Known Member
I just want to thank everyone for there idea's. I don't know what happened but I hooked the driver back up again and then boom.......we have lift off. I couldn't believe it. Here it is lit up.

I also changed out the middle 2 10w chips for 1 10w WW and 1 10w CW. That should fill in a bit of the green.
 

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JMD

JMD

Well-Known Member
jimjim2609 said:
If you have a look at the pic all 10 crees are in series but i disconnected the wire connecting them at one end so that only five were now wired in series. Thats what i mean by 5 on each side.
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Take a look at what you said earlier. 3.5V per LED and your driver is rated at DC:20-39v 1200mA, so when you only run 5 you have a voltage of 17.5V - which is less than 20V ;)
So the driver increases the voltage till 1200mA is achieved, which is below it's stable point (20V) which results in flashing.

If you connect all 10 LEDs in series, you should have no problem.
 
Bumping Spheda

Bumping Spheda

Well-Known Member
Nah, he used a 10W driver as a test using five LED's in series. It was the driver meant for and wired up to the full string of 10 that was flashing.

Good to see you got it working, jimjim, light looks killer.
 
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