Doer
Well-Known Member
I would never have guessed those beans were so old! must have been well stored eh?![]()
Notice how they had pop-top lids even back then. But they decided to take them back off the market and wait 60 years.

I would never have guessed those beans were so old! must have been well stored eh?![]()
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
Ya buddy!!! Nice and chunky.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
THNX guys, LED bud - genetics update
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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\ Just be careful, and make sure there's no gap in between the chip, and sink.
If you haven't bought the COBs yet, get some CXB3070 AB or AD. They're more efficient and probably not more expensive.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.
Where is the best place to purchase these? I can only find them in minimum like 50 or whatever?
So you were the one who ordered 16 of the 3000k lol[email protected]
Send a note to the sales guy Jerry. I just ordered 16 CXB3590 for $50.50 each.
Usually $86 for 1 and digikey.