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Bahahaha! I'm already utilising bathroom vents to their max. Fresh air comes into the loft via what was the bathroom extractor vent situated in the eaves of the roof. Warm air is extracted out of the grow room via an inline carbon filter which leads to the old extractor vent in the bathroom...

Yeah. I know I could have better in terms of efficiency but not without spending (at the very least) 5x more.

Lol!! Im in a loft! I have no windows (unless I go through the floor)! And I'm all about ultra stealth! I've checked my place out with a FLIR camera to eradicate any heat sig. I have my fans on variacs to keep the noise minimal. I've got my air double carbon filtered and vent into my house so...

I wish I could. That would be the ideal setup but this is the best I'm going to manage until I decide to remodel the whole house (not feasible for 2-3 years).

Cobs are mounted directly onto the water blocks. Water gets pumped around a loop it goes something like this: Pump -> Radiator -> Water blocks -> Pump Water temp is around 28C going towards the radiator and 38C coming back in a 25C room. By actively water chilled I mean with a water chiller...

My setup is not actively water chilled. I run a car radiator and a 12V car radiator fan (at 5V so its barely audible). Water pump: 28w (Eheim 1250) Rad fan: 35w (80w "universal" 16 inch fan running at 5V) Total 63w. To cool 3600w of COBs that's not too bad. Under 2% of total power draw is for...

I've thought about a chiller in the circuit but I'm very limited for space. I have nowhere to put a chiller with enough cooling capacity to handle my lights. Then there's the additional ambient heat to consider. If I weren't in a loft it might be an option... Maybe in the future! I've seen...

It will be more than adequate. I have 6 mothers under 110w of T5 lighting... They grow more than I could possibly ever use. I could do a 200 plant SOG and still couldn't use up all their new growth every 2 months.

... You have the memory of a goldfish! You posted in my build thread :D https://www.rollitup.org/t/water-cooled-cobs.909674/

I've ordered the bits tonight to make some improvements on my previous efforts. Should have it all in my hands this week (touch wood). Maybe I'll have 30x COBs on a 600w driver done by next weekend as a prototype? Maybe I won't. If I didn't have a day job I could probably have the whole setup...

A dollop of thermal glue... and tada! Worked perfectly for my current setup. The alternative would be kapton tape and thermal paste which is probably more fragile but would cool marginally better. Mounting COBs onto water blocks in any other way is difficult. You can't screw into a water...

Bahahaha!! Now I've completed a grow I plan on experimenting :) I'm going to run 90x water cooled CLU046 COBs at 20w (36V @ 0.55A) each per 8x4 area. So 900w per 4x4... at around 1300 PPFD (may or may not be a little higher because I'm water cooling and so COB temps shouldn't be as high)...

Just ordered 250x Citizen CLU046-1212 units. 180 for flower (3500k), 30 for veg (5000k) and 40 more (3500k) to play with side lighting :) Gonna have some fun with these things :D @Will Thayer helped me out on sourcing. At £2.20 each after delivery and considering I already have suitable...

1. I would insulate. It keeps the heat out in hot weather too. An uninsulated shed can become intolerable in the sun. 2. With 800w of Cree CXB3950s you're not running a massive heat load. Similar load to a 600w HPS. Good ventilation will keep your temps in check. If you run your lights on from...

If the guy is selling his book for $500 a pop he must think there's something in it. Only way to find out is to give it a go :) I've seen some talk about it but no real results. Worst case is I get a smaller yield and use it as a learning experience. Best case I have a load of massive colas...

10% of the weed you trim, cup of coffee and a biscuit? Any takers?! :D I joke but it's getting *really* tedious!

It is indeed extreme! :) Based on three a light: I'm hoping for the same yield with more manageable plants and easier trimming as all the buds should develop to roughly the same size... That's the theory anyway! If it works great, if not I can always try something else on the next run :)

So I have some final dry weights for Purple Afghan Kush and Pineapple Express... drumroll... PAK 352g (+8 seeds) PE 617g (+3 seeds) PAK was 4 plants in a 4x4 area under 600w PE was 4 plants in a 4x6 area under approx 8-900w (had them spread into space next to my Blueberry plants as there were...

Lol, yes it would be waaay too much for 0.7x0.8! Sorry, I was just trying to give you the highest light output using your drivers and didn't see your area in the OP. You have 0.56 sqm. If you went with CXB3590 72V at 0.7A they'd be running around 50w each and putting out around 2.62 umol/w. If...

For max light for minimal cost... Each driver: 3x Citizen CLU046-1212 3500k in series. Total 27 COBs would cost around $300. Should give you around 700w of awesomeness. Would be equivalent to a 1000w DE HPS but with 30% less heat.