CobKits
Well-Known Member
not at all, you may select a different driver (or not in the case of constant current drivers). driver cost is pretty flat per watt regardless of model
Introducing CobKits.com - specializing in DIY and Citizen COBs
CobKits
Well-Known Member
use a meter. one of those is usually just a ground. you should be able to measure resistance across 2 of the terminals on the pot which changes with turning the dial. these are the ones you want polarity doesnt matter
Axle4worc
Well-Known Member
Need to learn how to use my cobkits lights.
Veg tent
4x citizen 1818 3000K gen 6 cri 80
hlg-120h-48a driver Cranked all the way up.
SST 133 heat sinks
Angelina reflectors.
Spaced 9.5" from each other and sides of tent.
24"x48"x50" tent.
Minimum distance 18" from top cola.
Cheap lux reading 30-35k at top cola with reflectors on.
10 week old auto. 7 weeks into flower.
My plants were fine with the reflectors on. When I took the reflectors off, within 36 hours, the top leaves were all burnt. My guru mentor, who pointed me at these lights, said my plant should not have burnt. Could it have been the overlap when I took the reflectors off? Is there some other way to burn them? I am about to start some new seeds in Coco and don't want to kill them. I have a lux app on my phone but no other way of measuring.
My flower tent with her sisters has.
8x citizen 1818 3000K gen 6 cri 80
2xhlg-185h-48a drivers Cranked all the way up.
SST 133 heat sinks
Angelina reflectors.
Spaced 11.5" from each other
60x60x70 tent.
Minimum distance 24" from top colas.
No burning issues.
Veg tent
4x citizen 1818 3000K gen 6 cri 80
hlg-120h-48a driver Cranked all the way up.
SST 133 heat sinks
Angelina reflectors.
Spaced 9.5" from each other and sides of tent.
24"x48"x50" tent.
Minimum distance 18" from top cola.
Cheap lux reading 30-35k at top cola with reflectors on.
10 week old auto. 7 weeks into flower.
My plants were fine with the reflectors on. When I took the reflectors off, within 36 hours, the top leaves were all burnt. My guru mentor, who pointed me at these lights, said my plant should not have burnt. Could it have been the overlap when I took the reflectors off? Is there some other way to burn them? I am about to start some new seeds in Coco and don't want to kill them. I have a lux app on my phone but no other way of measuring.
My flower tent with her sisters has.
8x citizen 1818 3000K gen 6 cri 80
2xhlg-185h-48a drivers Cranked all the way up.
SST 133 heat sinks
Angelina reflectors.
Spaced 11.5" from each other
60x60x70 tent.
Minimum distance 24" from top colas.
No burning issues.
CobKits
Well-Known Member
I would expect the opposite, maybe the plants were starved for light and got shocked? usually in a tent light is most uniform without reflectors in my experience
Axle4worc
Well-Known Member
So, with reflectors, these lights are not bright enough with a hlg-120h-48a in a 2x4?
No clue what shock looks like. This is what it looked like just before I chopped it. Could have been another kind of abuse too. Only thought it was the lights because that was the thing I changed.
Attachments
CobKits
Well-Known Member
im gonna rerun cxm22 i have 4000k 80 on the way (i do have one sample in that color ive run before but its 6+ months old, that plus id rather run a chip from an actual production lot than a pre-production sample).
that sounds like a cool setup. put em on different drivers for spectrum control!
eyderbuddy
Well-Known Member
i have pretty much the same setup except that i'm using cxm22's, and It happened to me too when i transferred a plant that was grown under CFLs. I put my plant 11 inches under and 6 inches of top cola got burnt. That didn't last long though, a few days later the plant got used to it... But i learned that i need to do these kind of changes pretty slowly.
as of right now i'm vegging a bunch of seedlings 14 inches away without problems, it seems that they just need to get used to the intensity.
btw, i think you'd have a better spread without the reflectors
CobKits
Well-Known Member
youre not alone... after 25 years im still re-learning the details of our new tech
pop22
Well-Known Member
they don't have light burn. Looks like end of life N depletion and or ph problems to me
sixstring2112
Well-Known Member
Would love to see the 50v and 69v veros included in your test.
caretak3r
Well-Known Member
I can't like this enough. Given your input that most of the cobs are converging in efficiency < 30W, I'm thinking the next evolution of growing with COBs will go this direction. (more cobs, close together, driven soft). Should we start looking at some of the later generation cheapy cobs (100W driven @ 20W like @SupraSPL tested quite some time ago -- I gotta go find those old posts). I'm guessing even the Chinese copy cats have upped their game in the last 2 years.
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HydoDan
Well-Known Member
Isopropyl alcohol cleans em up then evaporates...
I just wanted to make sure the lens weren't super sensitive or anything. Thanks!
CobKits
Well-Known Member
on deck.Would love to see the 50v and 69v veros included in your test.
CobKits
Well-Known Member
another round of sphere tests. lets call this preliminary data as tests done on different days give different results due to variations in ambient temp.(shop is a warehouse with big rollup doors) Im getting antsy because it takes longer to mount the chips for testing than it does to run the test and i have all these fine specimens sitting here 
Today was more normal temps but the chips i ran the other day was a much colder day. i want to say -5C difference in ambient temps
"cold day" tests (will bias results slightly higher):
1216
1818
CXB3590 "A"
"warmer day" tests:
Vero 22C
Luminus CXM22
Luminus CLM22 (the alleged 36V counterpart of the CXM22, ~$1 cheaper)
CXB3590 "B" (same chip as "A" tested on different day)
observations:
-wow CXM22 dominating across the board at all currents. this chip was new to me. I dont stock 4000k 80 (tho i initially screened that color from a pre-production sample - this was a regular off the shelf chip from digikey). 1818 is catching up with it at 130W but probably not really as 1818 was a cold day test
-I was interested in Vero22 as it is the same package size as the CLU048 and CXM22, it does well at high currents but lacks at low currents for some reason. On a same-day test its crossing CXB3590DB above 50W but still lags behind the similarly priced CXM22 and also the CLU048-1818. Definitely living up to Vero's reputation as an excellent high current chip with great thermal characteristics
-CXB3590 day 1 and day 2 tests were similar trends, and you can see that ambient temp difference definitely having an effect (selling point for ducted hoods?). Again, you can see why i dont like to compare chips tested on different days, were seeing a 1.5-2% difference in relative output
at 50W were seeing a whopping 7% difference between top and bottom chips - so really any of these chips will do fine... chip cost really comes into play at that point. I would definitely say all these chips are in the same "class" of package size and relative die count. It will be interesting to see what happens when we bring out the big guns with larger packages and higher die count. The chips on deck include gen 6 CLU058-1825 and CLU058-3618, as well as Vero29 V7 and Luminus CXM27 and CXM32.
will also be running 1212 gen6 mostly in comparison to the similar 1216. i still have a warm spot for these chips as economical low-current champs.
Once we get to the formal test I hope to run dupes on most of these to check for output/bin variation, i think I have 2 of all of the chips except for CXM27 and CXM32
I am happy with the sphere performance, it seems to be giving more reliable low current data than the open-air tests
Today was more normal temps but the chips i ran the other day was a much colder day. i want to say -5C difference in ambient temps
"cold day" tests (will bias results slightly higher):
1216
1818
CXB3590 "A"
"warmer day" tests:
Vero 22C
Luminus CXM22
Luminus CLM22 (the alleged 36V counterpart of the CXM22, ~$1 cheaper)
CXB3590 "B" (same chip as "A" tested on different day)
observations:
-wow CXM22 dominating across the board at all currents. this chip was new to me. I dont stock 4000k 80 (tho i initially screened that color from a pre-production sample - this was a regular off the shelf chip from digikey). 1818 is catching up with it at 130W but probably not really as 1818 was a cold day test
-I was interested in Vero22 as it is the same package size as the CLU048 and CXM22, it does well at high currents but lacks at low currents for some reason. On a same-day test its crossing CXB3590DB above 50W but still lags behind the similarly priced CXM22 and also the CLU048-1818. Definitely living up to Vero's reputation as an excellent high current chip with great thermal characteristics
-CXB3590 day 1 and day 2 tests were similar trends, and you can see that ambient temp difference definitely having an effect (selling point for ducted hoods?
). Again, you can see why i dont like to compare chips tested on different days, were seeing a 1.5-2% difference in relative outputat 50W were seeing a whopping 7% difference between top and bottom chips - so really any of these chips will do fine... chip cost really comes into play at that point. I would definitely say all these chips are in the same "class" of package size and relative die count. It will be interesting to see what happens when we bring out the big guns with larger packages and higher die count. The chips on deck include gen 6 CLU058-1825 and CLU058-3618, as well as Vero29 V7 and Luminus CXM27 and CXM32.
will also be running 1212 gen6 mostly in comparison to the similar 1216. i still have a warm spot for these chips as economical low-current champs.
Once we get to the formal test I hope to run dupes on most of these to check for output/bin variation, i think I have 2 of all of the chips except for CXM27 and CXM32
I am happy with the sphere performance, it seems to be giving more reliable low current data than the open-air tests
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