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#1 dragonsfire

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Posted 24 November 2018 - 06:56 PM

So ive been tinkering around with LED's, taken a while since it can take a month for parts, dirt cheap when Ordering from China.

 

My IR 850nm leds working fine, thast for security system. 5-6v forward

The 3Wx4 works great (grow light spectrum). 3V forward

Problem is the 1W leds, no mater what i do they flash, tried three different drivers, tried from 3-15 in a string but no luck. 3V forward

If anyone has ideas??

Thanks!

 

 

IR 850nm

MTHeWLt.jpg

YVKbJi1.jpg

 

 

3W grow light spectrum

NJQ6Eha.jpg

5E8wj9u.jpg

 

 

1W leds being a pain.

lpKd2ZN.jpg

ItmtWQT.jpg



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#2 juanitos

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Posted 24 November 2018 - 09:41 PM

current is constant, add voltage. 

 

the 1w leds will use less current than the 3w. usually a 350mA driver instead of 700 (looks like you are using 900mA).

 

then you make sure you are within the voltage range by adding the leds. so for the 1w are 3.2V

 

so if you wanted to power a string of 10x 1W you would need a

a 350mA driver with atleast 32V like this:

s-l1600.jpg

 

the minimum output is 15 volts so you can do 5-11 1W leds

the current stays the same, always 350mA


Edited by juanitos, 24 November 2018 - 09:42 PM.

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#3 dragonsfire

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Posted 25 November 2018 - 01:18 AM

The couple drivers I have are in the 20-40v range and 900ma, so you saying it has to be a lower amperage to work properly? 



#4 juanitos

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Posted 25 November 2018 - 05:13 PM

yes, 1w should use a 350mA driver.

 

you could try to do series parallel

when you make a parallel branch it divides the current.

so a 900 mA driver / 2 would be 450mA.which might work ok. still overloading them a bit.

ZtRUJel.png

 

 


Edited by juanitos, 25 November 2018 - 05:13 PM.

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#5 dragonsfire

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Posted 25 November 2018 - 06:58 PM

I was thinking that,  as I wait another month for new driver lol

Thanks!



#6 dragonsfire

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Posted 26 November 2018 - 05:32 PM

So I did a 4x3 this morning, still flashing, the first three rows lit (flashed) the fourth row did not light up.

Max current would be 1.14 for three.



#7 juanitos

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Posted 27 November 2018 - 09:54 AM

which driver are you using, what are the specs?

flashing happened to me when i wasn't using enough led to hit the driver minimum.

 

you can test each led by putting 2 AA batteries together. 

FNOGL5TI6DYTUDZ.LARGE.jpg?auto=webp&widt


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#8 dragonsfire

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Posted 27 November 2018 - 11:29 AM

I tested the leds  already individually.

 

5ltwJDb.jpg

Lz3CE5P.jpg


Edited by dragonsfire, 27 November 2018 - 11:40 AM.


#9 juanitos

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Posted 27 November 2018 - 12:37 PM

hmm you got all the polarities right? 

 

no idea otherwise seems fine.


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#10 dragonsfire

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Posted 27 November 2018 - 01:55 PM

Yup, tested each one, driving me nuts. trying 3 to 15 units should have narrowed down the range, and trying three different drivers with the same effect proves its the led properties.



#11 dragonsfire

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Posted 28 November 2018 - 11:46 AM

Test setup of infrared light and camera. 850nm invisible to the eye with a 5meg pinhole camera (my 8meg for some reason stopped working) run by a Raspberry Pie all for under $100.

Easier to run higher wattage LEDs then the 1W, these are two 10W IR leds. All monitored from Browser over wifi.

 

TvcOuUo.jpg



#12 dragonsfire

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Posted 15 April 2019 - 06:35 PM

Got my little solar experiment going, just have to figure out arranging the LEDs to run on the DC.

$20 total, sealed solar cells 4x 6v 1.5W and controller.

Once I got it all figured out will wire it more solid. Charging fine.

 

70ZAhSG.jpg

38qDiWZ.jpg

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