DiY LED - Cree CXA3070

about the flickering,see through a videocamera, I'm noticing that although quality power supply CC PFC they do,
for example:
with Meanwell HLG/185/150 model = the image through the camera seems a luminous flux stable
with Meanwell PLM 25/40 model = the image through the camera seems a luminous flux pulsing
with Meanwell PLD 25/40 model = the image through the camera seems a luminous flux pulsing
with Meanwell LPF 40/60/90 model =the image through the camera seems a luminous flux stable
with Cincon LDP series = the image through the camera seems a luminous flux stable
 
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Some 3K CXA nugs, run bare at 25-28W ea, recycled organic soil in 5 gal buckets, about 8 weeks

Cali Connection - Buddha Tahoe OG (upper left)
Cali Connection - Alien OG (left)
G13 Labs - Sour Jack (center)
Sin City - Galactic Jack (bottom right)

CXA buds.JPG

Sin City - Galactic Jack (left)
Divine Genetics - Chem D X Girl Scout Cookies (right)
(Edit) Cannaventure - Garlic Breath (right)
CXA buds 2.JPG
 
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SupraSPL said:
There is a critical difference between direct PWM dimming and PWM controlled, constant current dimming. I am on the lookout for the type of drivers that run the LED at high current and simply flicker it on and off to achieve dimming. This reduces electrical consumption, light intensity and junction temp, but causes unnecessary loss of efficiency from current droop and can cause physiological problems.

The flicker I am referring to is repeatably noticeable to the human eye, although very slight, with this driver and this driver. I know the human eye cannot detect flicker in the kHz range, I expect this flicker must be in the 120Hz or lower range. No big deal but it is interesting.

Thankfully I cannot detect flicker on the LED laptop or TV screens, but you can check for it by viewing through a through a camera and see how flicker increases the more you dim it, and it goes away at full brightness. The high frequency flicker can have physiological effects in some people even if the eye cannot detect it directly. They can make screens and cars that can dim flicker free but most choose not to. I checked the screen on a pair of smartphones and they do not flicker when dimmed

LED MONITORS CAN CAUSE HEADACHES DUE TO FLICKER
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You're really the pioneer of Led-light, king of cobs :)
 
SupraSPL said:
Some 3K CXA nugs, run bare at 25-28W ea, recycled organic soil in 5 gal buckets, about 8 weeks

Cali Connection - Buddha Tahoe OG (upper left)
Cali Connection - Alien OG (left)
G13 Labs - Sour Jack (center)
Sin City - Galactic Jack (bottom right)

View attachment 3382647

Sin City - Galactic Jack (left)
Divine Genetics - Chem D X Girl Scout Cookies (right)
View attachment 3382648
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Ya buddy!!! Nice and chunky.
What do you think of Buddha Tahoe. Clearly grows much nicer from that pic there. I'm just not a huge fan of the regular Tahoe clone.
 
THNX guys, LED bud - genetics update :eyesmoke:

The Buddha Tahoe OG smoke-tests pretty well so I bought more beans to see if I can squeeze any more out of it with selection. It is indica dom but not too compact, slow vegging, fast flowering, stays green/purple during flower, dense nugs. Great smoking flavor and great high. This lady smells like cherry fuel but I expect you could find some with the OG dominant cologne. Not a mega stinker in the jar.

All 4 Alien OGs were very similar to the BTOG in bud structure but the Aliens have OG cologne + hash (skunk coffee) smell that sticks around for months in the jar. They all tested well so I kept the 2 stinkiest and they are hard to choose between. Will keep testing them until one shows a weakness.

The Galactic Jacks have a sweet sativa pinene fuel thing going on. 3 of 4 tested well, but some of them were larfy so will probably keep the chunkiest which is the one in the picture. It has a mix of smells, some diesel, sweet, OG, pine, hash.

The Sour Jack is by far the frosty stickiest. It has a strong flammable fruity smell that many sweet skunks share like Space Queen, Cindy, Island Sweet Skunk and some Pineapple Express. Excellent bag appeal, good yield and a great smoke.

I have 3 Garlic Breath ladies to choose from. They are all sweet-funk smelling, no garlic or onion like I was hoping for. Two hermied kind of badly, one of which had pink/purple calyxs and did not finish on time. Out of 167 ladies, that is the second I have come across with pink/purple calyxs, the other being Ace of Spades. The one that did not herm finished on time and has a nice sweet smell with good bud structure.

We tested 4 Gage Green Aspirare (King Louis xiii OG (x) Joseph og) ladies. They did not come out very frosty and 3 of 4 did not get thumbs up in smoke test. One has a nice OG smell but it does not stick around long in the jar. 4 is not a very big selection but a data point worth mentioning.

And finally, the Divine Genetics - Chem D X Girl Scout Cookies. 3 ladies to choose from but 2 hermied quite a bit. Luckily the one that did not herm was my fav because it had very strong Chem + hash aroma + and got thumbs up in the flower smoke test. We also smoked the hash scraped off the scissors while still fresh and the smell/flavor was disgustingly awesome, just like the Chem should be. The GSC dom was pretty but not a special smoke and since it hermed we'll skip it.
 
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SupraSPL said:
THNX guys, LED bud - genetics update :eyesmoke:
I have 3 Garlic Breath ladies to choose from. They are all sweet-funk smelling, no garlic or onion like I was hoping for. Two hermied kind of badly, one of which had pink/purple calyxs and did not finish on time. Out of 167 ladies, that is the second I have come across with pink/purple calyxs, the other being Ace of Spades. The one that did not herm finished on time and has a nice sweet smell with good bud structure.
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I'm gonna try Charlotte's Web, i love purple :) it's tranquility and warmth in one color
 
nice work congratulations SupraSPL
I'd be curious to have laboratory test in terms of the concentration of active that may return 3k in your configuration.
in my opinion the application of LEDs with the correct spectrum returns a higher concentration of THC,CBD and other, compared to conventional lighting systems...
 
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Jeeyah said:
\ Just be careful, and make sure there's no gap in between the chip, and sink.
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Sanding an extrusion is necessary. No amount of goo can fill those sag areas. It is just a part of metal cooling. It shrinks.

I am sanding a 2x2 inch extruded tube. The sides are higher than the middle. But, when I got down to the middle, it is not flat either. Sags within sags.
 
I have been reading this thread for over a week trying to get everything in order. Want to roll with the z2 3070 3000k and want to use bar heat sinks. Was thinking of running 4 per heat sink with 2 units covering a 4x4 area. At 1.2 A each. So my questions are. Would this out perform a 600 w hps and be close to a 1000w? Which drivers would you recommend for this type of setup? Would rather use a single driver or even 2 per fixture. And would this heat sink work for 4 of these driven at the specs above? http://www.ledgroupbuy.com/makersled-designer-heatsink-kit-professional-grade-anodized/ . I really appreciate the help and all the time and effort you guys have put into this. I would never have thought to build my own Until reading this. I'm not so great at calculating this efficency etc but I know I don't want to run hps if I can run these cobs at half the power and get the same results. Any help would be greatly appreciated.
 
Getgrowingson said:
I have been reading this thread for over a week trying to get everything in order. Want to roll with the z2 3070 3000k and want to use bar heat sinks. Was thinking of running 4 per heat sink with 2 units covering a 4x4 area. At 1.2 A each. So my questions are. Would this out perform a 600 w hps and be close to a 1000w? Which drivers would you recommend for this type of setup? Would rather use a single driver or even 2 per fixture. And would this heat sink work for 4 of these driven at the specs above? http://www.ledgroupbuy.com/makersled-designer-heatsink-kit-professional-grade-anodized/ . I really appreciate the help and all the time and effort you guys have put into this. I would never have thought to build my own Until reading this. I'm not so great at calculating this efficency etc but I know I don't want to run hps if I can run these cobs at half the power and get the same results. Any help would be greatly appreciated.
Click to expand...
If you haven't bought the COBs yet, get some CXB3070 AB or AD. They're more efficient and probably not more expensive.
 
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