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So what I ended up doing was cutting a small square out of each holder directly over the contacts to reveal them. After doing this I was able to carefully inspect the connection between the contact tabs and the pads on the cobs and noticed that one of the tabs was sticking out too far, and was...

So I went ahead today and wired the four cobs with new holders and wire, and what do you know, it still isn't working. I took a meter and checked the voltage along the path and found it was getting power across each holder, and also confirmed there was no accidental grounding somewhere. Each of...

I think you may have misinterpreted my post? I have already found the culprit to be faulty cob holders, not the cobs themselves. The "defective" cob you are speaking of still lights in the non faulty holders, it just has several rows that aren't lighting, making it dimmer than the rest of them.

Alright so I swapped the drivers over and both drivers lit the working string of lights so the drivers are fine. I went ahead and disconnected the fourth light from the working string and starting subbing lights from the other string one at a time and found that only 1 of 4 lit. Thinking this...

Going to try both of these ideas right now, not sure why I haven't done this yet... lol. ...what?

So quick update, still no luck. Tried disconnecting the dimmer as suggested but that didn't work, I'm pretty sure the dimmer was wired properly as well since the other half of lights that are working dim properly from the pot, and both sets of dimming wires are wired identical. I also tried...

Yeah I'm using one dimmer between the two drivers. Will they still light without anything connected to the dimming wires?

Hey all, so I just finished building my third cob for a 2x4 tent using 8x citi 1212's, but for the life of me I can't quite figure out whats going wrong here. As it is right now, the build is two HLG-185H-1400B drivers each powering two clusters of four cobs, each wired identically. One side is...

Cheers, thanks for the info on the silica, I'll look into adding that into my next grow. Is everyone adding this to the res or are you foliar spraying it?

I always wondered about this since one of the guys at my local hydro shop who's actually pretty knowledgeable suggested I add this as well, but I kinda assumed it was snake oil without really looking it up. There seems to be a wide variety of products for silica supplements, I wouldn't mind...

Yeah you're definitely right about the hard diagnosis, especially since the early symptoms looked like a deficiency and there was no apparent bleaching or anything. The leaves did starting pointing up and rolling inwards on the starfighter once things started getting bad, however the harlequin...

I'm running RDWC with around 1500 GPH of air over six buckets with 2 large stones at each site, plus water temps are chilled to around 66-67 so I don't think its an o2 issue. Roots are also snow white in color with no hints of slime or browning. Here's some more recent photos I took today...

The symptoms are definitely worse in areas directly under the lights, but they are mostly apparent on the enture canopy at the top. However, going down just a few inches below the canopy top where it is partially shaded there are no symptoms. Sounds like a pretty similar situation then, I...

Sounds like it's definitely an issue with it just being too much light then. Did you get the same brown/crispy leaves from this? My harlequin plants are definitely taking it a lot worse than my starfighter, which is showing minimal stress compared to the harlequins. Despite all the problems the...

Thanks for all the info and quick replies. I'll start out lower as you suggested on my next run and raise it to the sweet spot. I wasn't aware about that for LEDs, I figured there would be some learning to do with the COBs, I'll try to raise the temps up a bit. I have a hard time raising the...

I started running the Floralicious+ and Mammoth P based on recommendations from several other friends running hydro/rdwc since I'm running bennys and not a sterile res. The temp issues has since been addressed with AC and changing the lights on time to at night. I do think I'm going to drop the...

Hey all, so I built a COB fixture using 8x citi 1212 3500k 90cri's for my 4x2' tent. The lights at the time were being driven at ~50-52 watts each and the fixture has been roughly 10-12" from the canopy for most of the grow. At around week four or so I started noticing some rusty spots on the...

I have a few cheap ebay cobs in my clone tent that I have had no issues with for almost six months now. At any given wattage they definitely output less than my citizens, but considering each one including heatsink was less than the cost of one citi 1212 I have no issues using them as an...

This is pretty interesting. Do you remember the name of the article or know what concentrations of ionic manganese they were spraying?

Had this issue with the last grow I did with my new cob fixture I made. I suspected a calcium issue as well but adding more calmag and foliar feeding didn't do anything to touch it. By the time it was too late someone suggested that it was possibly too much calcium locking out other nutes from...