DiY LEDs - How to Power Them

UKpeanuts

UKpeanuts

Well-Known Member
draz said:
I'm looking for some assistance finding low mA drivers for a veg light. Likely running vero10s(or cree cxa/b). In an ideal world pwm dimmable would be great but I dont think low wattage drivers exist(for a decent $$).
Looking at these drivers. Might configure two in parallel to give me 150/300ma running mode.
Or these, don't know if there is any difference between a led standard driver and a t8/t10 led driver(You can ask for them in 100-300ma configuration,and their efficiency seems really good).
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I had a hunch all these supposed constant current sources were actually constant voltage sources. Thanks for clearing that up.
 
G

GetThatPoison

Member
I thought I bought HLG-185HC-1050A but got the external dimmer HLG-185HC-1050B delivered today. i didnt order the pots. can I pickup locally or wire them dimming wire together to see how cxa3590 run. thanks
 
SomeGuy

SomeGuy

Well-Known Member
GetThatPoison said:
I thought I bought HLG-185HC-1050A but got the external dimmer HLG-185HC-1050B delivered today. i didnt order the pots. can I pickup locally or wire them dimming wire together to see how cxa3590 run. thanks
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someone here will correct me but I think it would be easy to find a 100k pot at a local electronics place. doesnt take long to have one shipped either.

@SupraSPL its a 100k pot for one of those drivers? but you would want less if running multiple drivers? heads a little cloudy tonight.
 
zangtumtum

zangtumtum

Well-Known Member
SupraSPL said:
I think if you leave the connection "open" you will get full power. So you can use the driver that way until you get the POT.
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exactly, for models HLG-100/120/150/185 - B version(external pot) works like this...I test all this model with and without pot in different config and combination
 
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Doer

Doer

Well-Known Member
WDIK said:
Well that was uneventful. Infrared thermometer showed heatsink temp at 73F the whole time. I drilled and tapped the heatsink and have the COB screwed on with thermal compound in between.
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So, you are one year ahead of me! I am thinking an LED set up would be perfect for an insulted shipping container. I can slip one beside my house, where there is an RV driveway, behind the front fence.

I've seen 20ft containers for under $2000.
 
Doer

Doer

Well-Known Member
WDIK said:
Yes, I was happy with the results. I may go with a 9v Mean Well driver for the fans. The 36w reading was also interesting to me. Since I am trying to build 2 panels to each cover a 2'x2' scrog I may go with 5x Vero 18 for each panel versus 6. That should give me 180w per panel (45w per square foot).

Now I know this is a somewhat "scientific" thread, but let me digress a bit. I have 2 plants currently growing very well under 414 "true watts" of CFL. From what I observed with my half burned retinas last night, there is no way that single COB didn't have the light intensity of 3 to 4 of those 23w CFLs. Again, not scientifically measured, and maybe it's because the light is so focused.

Let me know if you have any thoughts.
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We don't see the PAR very well. And don't look, or you can see PAR less and less. :)
 
Doer

Doer

Well-Known Member
PetFlora said:
Multiple small cobs ~ 10-20w, maybe 30w (or 50w?)seems like the ideal as they cover ~ 12"- 24" square footprint, possibly throwing a very nice 2-3 ft umol footprint

Here the cobs could be a mix of CW/NW/WW with separate o/o switches

As to penetration, there are several Defoliation techniques that would significantly open up the lower 10-20" of a plant
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Since the leaves are more or less transparent to PAR, defoliation throws away THC. It is based on a wives tale that you are shading the lower leaves. But, you are not.
 
Greengenes707

Greengenes707

Well-Known Member
Doer said:
Since the leaves are more or less transparent to PAR, defoliation throws away THC. It is based on a wives tale that you are shading the lower leaves. But, you are not.
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Can you elaborate on your statement of transparent to par and throwing away THC from fan leaves?
From how I know it, only about 20% max is getting through the leaves...and most of the red and blue ends are letting much much less through.
Check out/look up transmittance, reflectance, and absorptance...

Transmittance is how much is passed through the leaf...
AbL_Trans.jpg

Reflectance is how much bounces off and is what we humans see as colors
AdL_Refl.jpg

Then absorptance is the combination of the two showing what is actually left to be used by that leaf
And this is non-normalized...raw absorptance. Also, all this data is based on cannabis specifically, but does apply to many other species.
Absb..jpg


And another note...don't quote pet flora, it's pointless...long story...but trust us on this.
 
Doer

Doer

Well-Known Member
Greengenes707 said:
Can you elaborate on your statement of transparent to par and throwing away THC from fan leaves?
From how I know it, only about 20% max is getting through the leaves...and most of the red and blue ends are letting much much less through.
Check out/look up transmittance, reflectance, and absorptance...

Transmittance is how much is passed through the leaf...
View attachment 3366517

Reflectance is how much bounces off and is what we humans see as colors
View attachment 3366520

Then absorptance is the combination of the two showing what is actually left to be used by that leaf
And this is non-normalized...raw absorptance. Also, all this data is based on cannabis specifically, but does apply to many other species.
View attachment 3366518


And another note...don't quote pet flora, it's pointless...long story...but trust us on this.
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Oh come on. Pet and I are buddies. :)

The point is the leaves get proportionally larger, to take more light despite the reductions thru the layers of translucent.

You ever wonder why those leaves are 80% bigger at the bottom?

And you throw away THC, not in the fan leaves, but because you have reduced the fan leaves. And so you have reduced the ability to produce to the fullest.

Take an 8 cylinder car and unplug 3 of the sparks. It still runs. But, not well. So, the idea that you are increasing anything by taking fresh fan leaves from the bottom, is wrong. Pet and I have discussed this before. So he puts up his idea, and I counter it. :)

All plants are very much the same. But, we are not flowering this one. We refuse it. So, all that business from the Dutch hippy Flower Newt producers, is wrong, ie reducing Nitrogen, etc.

Ganja Myths, I say.
 
Scotch089

Scotch089

Well-Known Member
So does anyone have a driver model # that runs low voltage and is dimmable? Preferably meanwell. I can find tons that fit but are not dimmable. Trying to rig my spare 6 xml2s (2.85V x 6= 17.1V [700mA]) the clone chamber to replace my t5s. Anywhere from 700-1400mA, closer to 7 the better but if a 14 can get dimmed down were good.
 
Positivity

Positivity

Well-Known Member
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