DIY Modular LED-Light

stardustsailor · Apr 18, 2013

Correction :

Difference is not just 2-2.5 °C ....
At calculations fans are set at their typical operational voltage ..48 V ...
In real life measurements ,I had them running at 39 V ..
So real difference should be couple degrees more ...
3-5 °C ...(lower ,than calculated... )
Wow...

That's quite a "deviation" ,from theoritical calculations ....

But still ...I measure led case/mcpcb (where they "meet ") to be 16-17° C above ambient ....
...
That means that Tj is ~18-20°C ,above ambient ?
If Ambient temp is i.e 20° C ,then Tj is ~40°C ...???
Is that possible to be happening with that box-fan-heatsink-mcpcb design ?

..?

guod · Apr 18, 2013

A) Since the fans are placed side by side ,their air-flow is multiplied by two ...

So total air -free- flow is 72,52 CFM .

theorie... in realty we get about 80-90% of them.

Reds : 4 x 2.35 x 0.7 = 6.58 Watts at 700mA
WW : 8 x 3.4 x 0.7 =19.04 Watts at 700 mA

Through efficiency ..
At average 65% is heat ..( Rough estimation ) ..say for both leds ( reds T3 bin 355-400 mW output ) ( WW lowest bin ...Say 350 mW output ? )

i see at my model less then 30% efficiency.
best way here is to calculed without this efficiency, gives also some safety.

now we have to go for the pcb, about 1-1.5°K/W...(Rough estimation over pcb, glue or grease)..
gives about 15-20°K
.. and here is your mistake....

the whole calculation of a heatsink or junktion temp is as good as your parameter and you never get them all and in the right manner. so calculate for the worst then it can only be better.

stardustsailor · Apr 18, 2013

i see at my model less then 30% efficiency.
....

So low ?

guod · Apr 18, 2013

stardustsailor said:
i see at my model less then 30% efficiency.
....

So low ?

yes, but i will check these part of the program again in the next days...

for your pleasure...
http://www.dfisica.ubi.pt/~hgil/FotoMetria/HandBook/luz.html
http://www.brucelindbloom.com/

stardustsailor · Apr 18, 2013

Thanx for the links ...

ya bongo · Apr 21, 2013

hi Guod,

here is the first Prototyp of the Farred booster. Looks a bit shitty I know, but the next three will be nicer, I swear!!!
Perfomance of the Booster is better then my calculation.
10 minutes at 0.4A(2.7W), witout additional Cooling, the thermo-couple says 43°C, and each Booster will be good for 5.7 Watt.

i´am waiting for some Parts to get the PWM-Processor ready. here is a pic where i am.
after checking the wireing I put all 4 ch. in one box.

yabo

RainerRocks · Apr 21, 2013

stardustsailor said:
6.58 * 0.65 =3,29 Watts heat from reds ....
19.04 *0.65 =12,376 Watts of heat from WW ...

15,666 Wats of heat ....(Hell .... )

6.58 * 0.65 = 4.277 Watts
19.04 * 0.65 = 12,376 Watts

Total watts heat 16.653 ?

Am I doing it wrong ?

ya bongo · Apr 25, 2013

Some impressionen from the new light, guod and I developed two months ago.

this module starts at 24W in veg. and goes up to 45W in flower-mode.

these pics are from day 30, counting from fully developed cotyledons, </Sativa dominant AF Strain; 100% organic/>

full view of the plant to see the size and both grow spectra

- lightspectrum in veg mode.

- lightspectrum in full flower mode.

we can also switch the light to about 5600K, what makes work on plants much easier.

yabo

HiloReign · Apr 25, 2013

ya bongo said:
Some impressionen from the new light, guod and I developed two months ago.

this module starts at 24W in veg. and goes up to 45W in flower-mode.

these pics are from day 30, counting from fully developed cotyledons, </Sativa dominant AF Strain; 100% organic/>

View attachment 2631054

full view of the plant to see the size and both grow spectra

- lightspectrum in veg mode.

- lightspectrum in full flower mode.

we can also switch the light to about 5600K, what makes work on plants much easier.

yabo

Very cool grow my friend. I'd appreciate you sharing more about your setup.... Btw, awesome looking mutant leaves.

guod · Apr 25, 2013

HiloReign said:
Very cool grow my friend. I'd appreciate you sharing more about your setup.... Btw, awesome looking mutant leaves.

the light is top secret... :sleep:

but i will give you a hint...

really, we need some more tests,
heatsink and fan is not clear at the moment.
thinking about a stepper switch instead of a poti to get the same spectrum every time,
and way more things that have to be cleared.

...and most exciting, is our plan to sell a modular version of this product (JABO-GD*), allowing for the ultimate growing experience.

stolen and modified from "http://radiantledgrowthsystems.com/"

*GD stands for Grow-Devil

HiloReign · Apr 25, 2013

guod · Apr 26, 2013

^^^money

[video=youtube;Vwm4cMS1dEc]http://www.youtube.com/watch?v=Vwm4cMS1dEc[/video]

PetFlora · Apr 26, 2013

Looks like a chart of how a woman's mind works. You could become famous

PSUAGRO. · Apr 29, 2013

Guod..........you sneaky Bastard, I knew you where up to something BIG!

I wanna play with one of your toys :clap:

RainerRocks · Apr 29, 2013

3rd picture looks like a robot face with eyes..nose and teeth ...

ya bongo said:
hi Guod,

here is the first Prototyp of the Farred booster. Looks a bit shitty I know, but the next three will be nicer, I swear!!!
Perfomance of the Booster is better then my calculation.
10 minutes at 0.4A(2.7W), witout additional Cooling, the thermo-couple says 43°C, and each Booster will be good for 5.7 Watt.
View attachment 2625443 View attachment 2625444 View attachment 2625445

i´am waiting for some Parts to get the PWM-Processor ready. here is a pic where i am.
after checking the wireing I put all 4 ch. in one box.
View attachment 2625447

yabo

ya bongo · Apr 30, 2013

HiloReign said:
Very cool grow my friend. I'd appreciate you sharing more about your setup.... Btw, awesome looking mutant leaves.

thanks hilo,
talking about the setup, it´s nothing special here, an unused bathroom, soil, water and 20 hours of light. 100% organic grow style. and i am a guy how like the Idea behind "demeter"

I started this test with 24 watts of the vegetative spectrum for 10 days.
after that i go up to 35W. the spectrum changed also to more red and less blue.
at day 31 I set the light to the 45W flowering spectrum. this is also the maximum light the panel can give. blue is now on the the lowest level. lets see what happend.
the plant needs 2 days to adapt to this spectrum but see for yourself.

plant under this spectrum

yabo

guod · Apr 30, 2013

ya bongo said:
thanks hilo,
talking about the setup, it´s nothing special here, an unused bathroom, soil, water and 20 hours of light. 100% organic grow style. and i am a guy how like the Idea behind "demeter"

...

yabo

- stay save @ this growrate -

- they are behind us -
they wanna play with our "TOOYS"

PSUAGRO. said:
Guod..........you sneaky Bastard, I knew you where up to something BIG!
I wanna play with one of your toys

[video=youtube;v7JtLlKq8Kw]http://www.youtube.com/watch?v=v7JtLlKq8Kw[/video]

guod · May 3, 2013

from my grow-box under the light of the guod old 30W "gasstove"
same strain as under the new light in post:
https://www.rollitup.org/led-other-lighting/547085-diy-modular-led-light-17.html#post9005299

pics from 5. week

about half the size, but more compact.

PetFlora · May 4, 2013

Correction: Took me a while to figure out you meant safe (STAY SAFE) not save

ya bongo · May 6, 2013

this plant is in a hurry!
40. day

yabo

DIY Modular LED-Light

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