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Hi all, I've been reading the www all day and I'm still not sure which way to go so I'd thought I'd ask your good selves. I have 2 GT205 NFT trays, both in veg, 2 plants in each. Issues arose and the short story is plants were neglected for a few weeks. When I got back to them, there were...

I'm about to start my 4th scrog in a couple of weeks. Agree with the above, get your net in now and start training the branches outwards as soon as possible, it will encourage the lower branches to grow faster. Couple of things I have learned is to be brutal with the pruning. You want a screen...

yeah it's much easier to find the right driver with 36V cobs. 16ga wire will be fine, it's just slightly thicker. I chopped up the cord from a broken vacuum cleaner for my wires, it is important you buy wire rated above the maximum voltage you will be using. You have 2 different efficiencies...

P = V x I 72V x 1.4A = 100.8 Watts. The 70V cobs are actually 2 of the 36V cobs built into 1 cob, so they tend to run around 72V (ish). The drivers are constant current, so they output 1.4A all the time. The voltage can be anything within the range specified. So, if you ran 2 cobs in series...

when in series, the voltage is divided across the cobs. Your only option is to run 2 cobs in series (140V) 1 cob would be 70V, so below the 89V minimum. It might work but the driver would not be able to operate in constant current mode. 3 cobs in series would be 210V so outside the maximum...

I forgot to type it at the time, but that 2100mA driver I was going to suggest dimming it down to 1800mA (ish)

I started out with the Mars Blurples and they do work absolutely fine, but I think they lack in penetration compared to cobs. Not really an issue for me as I run a scrog, just an observation. If I were in your situation (I would start selling some pot :) jk), I would look at it slightly...

Running 2 cobs per driver will be fine, but you won't be pushing the driver as hard as you could. You'll only get 8 cobs working like that, 4 cobs with 2 x 2 in parallel is possible, but probably not too bright. I wouldn't wire like that unless I had an individual fuse for at least each pair of...

It does seem a bit suss. I think it was one of Growmau's video's I was watching and he had a 1212 and a 3950 next to each other, the 1212 is a lot smaller. I couldn't find the 1818's or the Vero 29's anywhere, next time I think I'll go for the 1818's, I'll just have to track some down. Adding...

It's the COB's that make the difference, I wanted Cree 3070's or 3590's, but they seem to be like rocking horse shit this side of the Atlantic. The Citizen COB's I bought for £10 each from Estonia via ebay, with free next day delivery. The only way I could get Cree 3070's or 3590's was from the...

I've not sat down and worked it all out yet. COBS were £10 each so £80 Heat sinks were £67 for the pair Drivers were £153 for the pair. Fans were £10 for 3 of them. Ali angle was about £5 Spent about £20 on thermal grease/cable ties/nuts and bolts/assorted bits and bobs. The wire was salvaged...

Hey six, just read through this whole thing last night, wow, loving your work dude. My Citi 1212's have been up for 24 hours, the girls seem to be happy @ 18" so I've lowered it to 12". I'm really liking the reduction of blurple in my room. I'll build another for the other side of the room...

That's what I thought, thanks. I've not got the drivers yet (they are in the mail, expected on Friday) but I'm assuming the case will be earthed. I'll just tag an earth onto the case from the framework. I agree it may not be necessary, the drivers do have a lot of safety features built in, but...

Here's a safety question that's been bugging me. With all of that metal framework/heatsink hanging around, does anyone earth the framework back to the mains power socket or the driver chassis? My thinking here is that if the worst happened and the frame of the light were to somehow become live...

That's just what I was hoping someone would say, thanks man :) I really like the efficiency/low heat aspect so I'm hoping I can dim them a little. Plans are to make another one of these to replace the Mars, so that would be 16 cobs @ 50w each covering 14.5 sq ft, 55w/sqft. I think that's a...

Hi guys, I had to post here just to say a big thank you to everyone providing the information in this thread, it's really helped me to make the decision to go DIY. I've just ordered most of the parts I'm gonna need, I'm gonna post what I've bought and if any of you guys spot any problems let...

well, it's been 4 days of low lighting and low feed, and things have got worse :( Still more leaves going yellow. I read through this thread again yesterday and noticed I had written "everything was fine during veg", so I sat and thought about what I had changed after flipping (apart from...

OK Thanks, I thinned out below the canopy gradually over the first 2 - 3 weeks after flip, I took away all the sucker shoots, but I didn't want to take the fan leaves away as they were still getting some light. I am losing quite a few leaves from below the canopy on a daily basis, which I...

Cheers guys, I don't seem to have any issues with burning of the tops, I have moved my lights up from 10" away up to 20" anyway. I've not been keeping a record of the pH, but it has consistently been rising, I have to adjust it every day. Last night I set it at 5.8 and by morning it was up to...

Couple of noob questions coming up... In the past I've only used Ionic single part nutes, just used bloom when in flower and never had any problems. So, am I right in thinking that if I'm using A + B, + CalMag + PK13/14, I should be using 1/2 strength of all 3, then adding extra water to get...