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Back there in Post 481 - majins posted pictures of his DIY LED light. He oughta move the driver some other place. The way he's got it strapped across the fins it's blocking the exhaust heat.

Whoops. Sorry. Didn't know Pro-Mix wasn't dirt.

I'm a newb at this, but that patchy interveinal necrosis sure looks familiar. I fought this with fresh FFOF a year ago. Although I googled around in my newbish way and thought the prob had to be calcium or magnesium related, repeated doses of a commercial Cal-Mag solution never made the...

Some of Ideal's holders have the keyway slots, some don't. The 50-2234C's I bought over a year ago didn't.

Looks to me like something dripped across the plant and the plant didn't like it. Unless I'm mistaken there are smaller bits of necrosis in the background. Notice how the damage is roughly in a line?

Thank you, Scotch, for bringing that up. The Ideal holder's metal plate has two dimples that touch down against the heat sink. Some guys were grinding those dimples off. Don't do it. I contacted a rep from Ideal. He confirmed the dimples are there to position the holder at the intended...

+1 I like the toothpick idea. I'd been using a jeweler's screwdriver. A toothpick's more forgiving.

Kuifje, the Ideal holders are a little fussy to use. Did you find my COB Holders - The Basics thread? Doing a few dry-runs without the paste might be advisable. You know by now that the Ideal holder relies on that tiny spring arm to keep the COB in place. The spring arm can easily lose grip...

Thanks, Psuagro, I didn't know about the Philips. Dangit, the troffers in our kitchen are T12. I'd like to try a few of these out. I don't know what's different between T12 and T8 aside from the physical size.

Does anyone understand how these CREE TW tubes work? http://www.homedepot.com/p/Cree-TW-Series-48-in-T8-32-Watt-Soft-White-2700K-Dimmable-Linear-LED-Light-Bulb-BT848-17027FLW-BDG13-1C100/205737568 They're marketed as direct replacements. No need to replace the ballast with an LED driver. I...

OK, they're not DIY, and they're expensive. Plus nobody seems to want to take my money. However, the Ideal reflector adaptors (RA) and Ledil reflectors (LR) are so cool I want them anyway. Let's look at the Ideal RA .pdf...

"I must say, those COB holders kind of suck..." Yeah, they are a little fussy to install but I'm sure you were getting better by the third or fourth one. Did you carefully inspect for bits of crud between the sink and the COB? Have you considered building a shroud of some kind? Reason why I...

I didn't include any pictures, but you might benefit from reading https://www.rollitup.org/t/cob-holders-the-basics.805034/ sds submitted a few good pics! Drilling a few holes in the heatsink won't hurt thermal transfer. Whoever told you that musta been self-medicatin'

I know some of you are perfectly happy with the thermal adhesive. I'm not saying that's wrong. I just don't like the idea. I just got to thinking this morning - what if I'd been using glue instead of paste while trying to assemble the LED as described above in Post #49? With paste I had all...

Tinning the leads helps. One big problem is using wire that's too big. 18AWG works best for me. I wanted to use the biggest wire I could to avoid voltage droop. What I found out was that I could jam larger wires into the Ideal holder clip but they'd pull right back out. If you were...

I've installed about 8 or 9 of these COB's now. I'm still learning, but have a better idea now than before. Remember earlier in this thread I wrote that it'd be suicidal to use straight-slot screws? I ignored my own advice the other day. Sure enough, the straight-slot screwdriver slipped off...

80 cm X 10 cm X 1.5cm is the same as 31.5 inches X 4 inches X .59 inches. So it sounds like the material you're describing is certainly long and wide enough for a heatsink, but the fins are very short. I'm not a heatsink expert but my guess is this type of sink couldn't handle a single...

+1 on church's comments. I bought two 4-step 5000K CX3070's last year. One is slightly bluer than the other. Took me a few days to even notice. I have no idea which is better for veg. Who knows, some strains might prefer a little more or less blue than others. But I could certainly see...

Thanks for the pointers, guys. Supra, I haven't kept up with your design philosophy but last year we both preferred efficiency over pushing the lights hard. If you were going to fire two CXA3070's, which Meanwell driver would you pick? I know, what a lazy ass. Thing is, I don't want to study...

Do you guys mind if I take the lazy way out instead of digging back through this thread? I've got some CXA3070's. Have stuck to the basic "one LED/one driver" recipe so far. I'd like to try firing two LED's with one driver. Something between 700mA each and 1200 or so. Don't want to go any...