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the Cree CXA3590 runs at about 1.4A at 36V. 1.4 x 36 = 50W so 3 in parallel would draw 150W which is about 80% of the HLG-185H's capacity (80% is a good rule of thumb). As an aside, most electrical engineers would recommend running series resistors off each LEDs negative terminal to balance...

you are correct, I'd only add that in a pinch you can run the HLG-185H-48A in constant voltage (CV) mode at 43-53VDC, giving you 5V more headroom.

Here is another power supply bargain: a 300w supply for $29 ($0.0967 per watt!) IP67, PFC, 94% efficient, etc. made by a good company http://www.allelectronics.com/make-a-store/item/ps-1028/28-vdc-10.71a-power-supply-led-driver/1.html they have 50+ units and will do free shipping if you buy...

The Samsung SL-B8T7N90L1WW strip at 66.5W has a 12 fold larger surface area to dump its heat than the 79.8W Vero 29, and its W/square mm is 14 fold lower! This means the strip LED is much easier to run cool without heroic (and expensive) effort. The Samsung strip has 96 LEDs each running at...

To put some flesh on the bones of the argument for LED strip with small LEDs vs Big hot COBS, check this this is a LED strip, made by Samsung and in stock at Digikey (SL-B8T7N90L1WW about $30), which can be paired with the currently cheap Mean Well HLG-185H-48A at BG Micro ($23) and built...

of note, this is exactly the set up in the new Fluence (BML) SPYDR: 0.5w 5630 SMD chips with 132 chips per "wing" but you're paying $1500 for 600w of LED.

Maybe COBs aren't worth the bother! Recently aluminum flex strip LEDs with 120 x 5630 SMD mount chips per meter have become available. They make 60w per meter and 5400Lm An order of 100m of them (4000k) costs $270 on Alibaba, and the strips are 15mm wide so a 1m x 1m square could use 48 x 1m...

The latest (now) Fluence SPYDR is full spectrum with each rail having 132 x 0.5w LEDs (warm and neutral) plus 8 red LEDs for some reason, so no more Blurple. They sell an 5 rail version (330w, SPYDRx) for $900 and an 8 rail version (660w, SPYDRx PLUS) for $1500. Nice designs but at ~...

yah internodal distance needs BLUE to be small, some like lanky but shorter bushy plants are often just the ticket. A Hg vapor plus HPS could probably help with the lanky veg.

How are COBS held on the water blocks? I see no screws and its tricky to screw into water blocks and avoid the water.

The OPs pump (Eheim 1250) has many great reviews and is described as running continuously for over 5 years! Another good choice could be a Grundfos UPS15-58FC 3-Speed Pump, about $82, very quiet, popular for hot water circulators and very durable...

$0.35/watt vs. HLG super bargain at $0.12/watt http://www.bgmicro.com/hlg-185h-48a-led-series-power-supply-48v-3-9a-constant-current-high-efficiency-by-meanwell-1-1.aspx

A $20 PID controller with an RTD thermometer ($9) can easily be set up with a fan to keep your area at an optimal 80-86F. These are the same units the foodies use to make Sous Vide...

FYI keeping things dead in water usually uses a biocide like the DOW Kathon family, or ProClin, similar to the preservatives in eye saline but better than old thimerosal. They are really biostatics; things do not grow. Some are sold on Ebay and a very little goes a long way.

I just received 20 of the HLG-185H's in original packing. These were part of an order of maybe 400-1000 Units shipped straight from Mean Well to Future Electronics in Southaven, MS they are likely recouping their wholesale cost at this volume. BG Micro will drive the 1h from Garland TX and pick...

Nice design! I'd be quite interested to measure the water temp on a single circuit of the system, you can actually calculate calories of heating with a given volume of water. In most systems like this (including big audio amps) you do not want to go totally serial on the water supply as the last...

FYI water soluble animal or plant protein hydrolysates are readily available and quite cheap for those who want to try supplementing free amino acids and peptides. They are commonly used in cell culture/microbiology. Yeast extract is a common one and smells much like the Kraft Mac-N-Cheese...

An extension of the above chart, if I subtly change the Vf I can get the most out of the PS finding the best value for 1yr operation gives it at 102% over-volt of Vf typical at 176W total (88w/COB) (I always try to not get higher than 95% of a PS's rated output) This is only valid because I...

the calculations above compares 3 under-voltage conditions and 3 over-voltage conditions for a combo of a Vero 29 Decor COB and a Mean Well HLG-185H PS. The extreme under-volt (-8% of Vf typ) allows you to run 5x more COBs (10) than the Vf typ (2) with this PS. The added up front expense of...

By all means run your COBs at typical (or lower) Vf and they will last forever, not overheat on the passive cooling favored here and allow you to run many COBs on a given PS. Pushing a Vero 29 to 140w dissipation is tricky and not a good choice for many, especially if your goals are reduced...