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Question: I will be running Citizens 1212-048 at 1.4A, 50W each, on Arctic Alpine 11 Pro CPU coolers, rated for 100W. What happens if a fan/ PSU dies? I suppose it all depends on the time it will take until I notice the failure. But let's assume I would be away 24h, would the Cobs survive? If...

Dear all, I need to reduce the speed of my outake blower. How can I achieve this? There are a few products on amazon to do this, but I'm not willing to pay 20$ or 30$ for such a simple piece of gear. I wonder if it is safe for the blower to be dimmed at any given rate, AC and DC motors might...

Cool. I ordered one of those cheap 50W 1500mA PCB drivers bundled with a 50W COB for 4$. I won't discard the possibility of using them in the future until I run some tests. If not good enough, it can be used for veg... clones, seeds, etc. How do you run your cheap drivers? Just mix them in the...

As chinese crap, I mean, what ebay sellers usually have. If they can build space stations, I'm sure they can build decent drivers if they wish. I could go with LPC but that would be a bad deal compared to HLG series. 5 units of LPC60 cost the same as a single HLG240, LPC series have 85%...

http://www.ebay.co.uk/itm/5x-CITIZEN-117-5W-LED-Chip-4000K-CITILED-cob-module-CLU048-1212C4-403M2K1-/222366269603?hash=item33c61000a3:g:crYAAOSwt5hYa6A2 There's a seller from Estonia with good price for the 1212, 3000k, 3500k, 4000k, 80 and 90 CRI. I bought 5 units last week. Should receive...

I wonder if this kind of chinese drivers have been tested side by side with the more communly used MW. The price difference is too significant to ignore. I guess majority of our appliances at home have crappy chinese components as well :confused:

I found these drivers, 1500mA, 20V-39V: http://www.ebay.co.uk/itm/282128772783?_trksid=p2055119.m1438.l2649&var=581092074256&ssPageName=STRK%3AMEBIDX%3AIT...

I'm struggling choosing the right driver for me. So, there's the HGL240-C1400 that will work but there are these chinese 20-39V 1500mA drivers for 6$ each on ebay. I would need 5, one per COB, still would cost one third of a single MW. 30$ 5 chinese drivers vs 100$ MW driver. Both with shipping...

50cm height, 40cm diameter. I could go a little bigger, but didn't find anything suitable for the job. I will use 1212 since these are cheaper and easy to find in EU. Yap, heatsink outside the tonel, that's the thing! For space bucket growers COBs are fantastic for this reason, the majority of...

#1 Sorry I didn't get it. Isn't the driver working less with 3 than with 5 Cobs? #2 Yap, I'm aware that venting the bucket is a major concern. In my other setup I have 85W leds strips on a plastic bucket, with two fans I can easily keep temperatures in the 23C-26C range. This time, using an...

Hey, I have been growing in a 6 gallon thrash bin for a while with SMD 5630 led strips. Time for some upgrades. I got this new 11 gallon IKEA aluminium thrash bin where I will be installing 3x Citizen CLU048-1212, I plan to run them with a HLG240-1400mA, dimmed to 700mA, 75W draw set up. If I...

Led strips are fine if you them have close to your plants, 3 inches or so. You can use them as secondary or main lights, I use as main light and I'm having better results than with CFLs, plus, dissipated heat is minimal. Seedlings with less than 100W will do fine, keep light close, not too close...

Ok thanks. 1 - If I have only one 1212 driven by an HLG-240H-36C (constant current), 1400ma, what would happen? The driver will pull 50W to feed the COB and that's all? 2 - if I have only one 1212 driven by a standard HLG-240H (fixed current and voltage) what would happen? The driver would...

One thing I don't get. 36.5V x 5 units of 1212 equals 182.5V. If the driver has a maximum output of 179V, what happens then? Voltage drop on the COBs?

From the graph it seems the 1212 loads 37V when working with 1400mA. So, for my set up with 5x 1212 it would sum 185V. The driver you suggest works between 89V - 179V. I would need to scale to HLG 320, I guess?

Thanks for your input. Now that you say it I feel kinda dumb, I forgot about the fan on the top of the small CPU heat sinks. What would happen if the heat sink is undersized for the COB? Less efficiency, plus risk of damaging the COB? Maybe thermal adhesive would be enough to hold the COB...

I want to build my COB lights, there's too much information around, it's hard work to put all pieces together. 1 - I want to use 5x 1212 running at 50W. Which driver should I use? 2 - CRI 80 or 90, since there's a lot of theory behind CRI let's put it this way, which yield more gram per watt...

I don't know how problematic that can be. Once males are cut the roots immediately start decaying allowing the remaining plants to take over. I would say growth is compromised a little by the males root mass, how significant that is I would like to know.

Nice set up. Do you feel a significant improvement: 1 - Using octopots over regular pots ? 2 - Using Quantum over COB 3070 and/or 3590 ? Apart from the fun part of projecting and experimenting, I'm curious about the math behind.

Yeah, I will, just started 4 new seeds, photo strain this time!