can you post a picture of the back side of the heatsink
Diy led
- Thread starter flworkd
- Start date
can you post a picture of the back side of the heatsink
brassmonkyballs
BMB
The backside? opposite the LEDs? Is so then no I don't want to take it all apart because there's nothing to see except all the fins which are 1".
What are looking for?
was just wondering what you used for a heatsink but now I know thanks
brassmonkyballs
BMB
5.88" profile from heatsinkusa.com
would you be doing a DIY thread? cus I'm looking in to doing pretty much the same thing as you with the dimming and all, I think I'm starting to wrap my head around the LED set up but I just have no clue on how to put it all together with the apex.
I'll be posting a detailed project description on my website.
Steven M
New member
Why do the led wiring diagrams have the 1 ohm resistor on the negative end of series?
This link has a calculator/wiring diagram. http://led.linear1.org/led.wiz
This link has a calculator/wiring diagram. http://led.linear1.org/led.wiz
Bugcrusher
New member
Solution 1: 12 x 5 array uses 60 LEDs exactly
+48V R = 8.2 ohms
R = 8.2 ohms
R = 8.2 ohms
R = 8.2 ohms
R = 8.2 ohms
The wizard says: In solution 1:
each 8.2 ohm resistor dissipates 4018 mW
the wizard says the color code for 8.2 is grey red gold
the wizard thinks the power dissipated in your resistors is a concern
together, all resistors dissipate 20090 mW
together, the diodes dissipate 151200 mW
total power dissipated by the array is 171290 mW
the array draws current of 3500 mA from the source.
FEDY leds FV=3.6@700mA. Meanwell ELN-60-48D driver. 12 leds in 5 strings with a resistor at the end of each string. What does the rest of this mean??? Should you use higher wattage resistors to handle the power dissipation?
+48V R = 8.2 ohms
R = 8.2 ohms
R = 8.2 ohms
R = 8.2 ohms
R = 8.2 ohms
The wizard says: In solution 1:
each 8.2 ohm resistor dissipates 4018 mW
the wizard says the color code for 8.2 is grey red gold
the wizard thinks the power dissipated in your resistors is a concern
together, all resistors dissipate 20090 mW
together, the diodes dissipate 151200 mW
total power dissipated by the array is 171290 mW
the array draws current of 3500 mA from the source.
FEDY leds FV=3.6@700mA. Meanwell ELN-60-48D driver. 12 leds in 5 strings with a resistor at the end of each string. What does the rest of this mean??? Should you use higher wattage resistors to handle the power dissipation?
Last edited:
brassmonkyballs
BMB
Not sure what diagrams you're referring to but generally a 1 ohm resistor is used in series with each string to take a voltage measurement of the string across the resistor...then use V=IR, or I=V/R which gives you the current running thought the string....voltage equals current with a 1 ohm resistor.
That wizard is a neat tool but not sure that is what you are referring to.
brassmonkyballs
BMB
That or maybe a smaller resistor. I see someone use 0.1 ohm resistor and suggest they don't get warm. Just have to multiply results by 10. I am using 1-ohm 10W resistors.
Oh...And...you can't run 60 LEDs off the 60-48.....not enough voltage or current
Bugcrusher
New member
I thought so, kinda suprized at the output, but I guess it is all there to let u know how much power u do need.
brassmonkyballs
BMB
I get it now...the calculator calls it a current limiting resistor...its really to knock down the voltage across the LED. if you put in 48V and Cree specs of 3.2Vf, 1000ma, and 60 LEDs it'll give you 15x4 array and 1 ohm resistors. Then the very last line give you total current consumed from the source. which is 4000ma in this case (which the 60-48 is not
)This is their simpler calculator where you should be able to more easily understand it.
http://led.linear1.org/1led.wiz?VS=12;VF=3.4;ID=700 where I put in 12V source, 3.4V Vf, 700ma
Steven M
New member
The LED series/parallel array wizard diagram put the resistor on the negative end of series, if I am looking at it right. I think I understand now.
3W 700mA $ 1.27 or few cent less..
18000-20000k 220lm 3.2v 60 degree
power supply : $ 39.00.. It can run up to 88 LEDs (11 in series 8 in parallel)
(no dimming)
and plus shipping fee.
C channel aluminum $ 2.00 per foot (local metal store)
few Arctic Alumina terminal adhesive $ 6
stainless nut & bolts,
just in case if need blue LED
3W 700mA Blue is $0.97, 25-30lm
What is the site where you got these prices?
Thanks
18000-20000k 220lm 3.2v 60 degree
power supply : $ 39.00.. It can run up to 88 LEDs (11 in series 8 in parallel)
(no dimming)
and plus shipping fee.
C channel aluminum $ 2.00 per foot (local metal store)
few Arctic Alumina terminal adhesive $ 6
stainless nut & bolts,
just in case if need blue LED
3W 700mA Blue is $0.97, 25-30lm
What is the site where you got these prices?
Thanks
flworkd
New member
e mail address for seller
Ava Sales@ledfedy.com
I think price 1.29 for white
and 2.29 for Royal Blue
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