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Not saying a watercooling loop is necessary for most of the heat loads discussed on this forum. I just would hate to see him go through all the trouble of enclosing a heat sink and covering it in mineral oil. That type of setup just won't be as effective as leaving the heat sink passively air...

Try using antifreeze with an anticorrosive additive along with a high flow/pressure pump and a car radiator or heater core. Probably will still need a fan, but it could be run at low speed and would likely provide more cooling capacity than a simple air cooled heatsink.

Enclosing your heat sink in a coolant, without also incorporating a pump and radiator, will cause the heat sink to not work. The way you dissipate heat across a temperature gradient efficiently, is through increasing surface area. By encasing the fins on the heat sink you lose most of the...

There's a 250w horticultural CFL and reflector http://www.amazon.com/gp/aw/d/B00HG1JRK0/ref=redir_mdp_mobile It might be good as a temporary measure until you can build or buy the led you want. They're $60. I've been pleased with mine so far. Its decent until I can build a cob setup.

Hello, I came across a PC hardware review site that includes C/W and heat capacity estimates in their cooler reviews. Hope the information is useful to some DIYers here. http://www.hardwareasylum.com/reviews

Also a note on safety. I'm going to hot glue over each solder joint before powering on. Will it be safe for me/the psu, to discharge the capacitors by bringing the terminals with an insulated screwdriver? I assume there will still be a deadly amount of current left after the unit is turned off...

Sorry to keep adding questions here, but I also haven't considered coverage yet either. This will be over a 2'x2' area. Could someone give me formulas for calculating coverage angles and light heigth requirements Pretty please?

I can't remember where, but I read that the 4k vero is similar in red light output to the 3k cree lamps. Is this correct, or is there more to it? I'll have the aluminum plate in a few days. I'm thinking about trying to braze the heatsinks to it with a MAP torch. Any thoughts?

Hello, After posting previously about some ideas I had for a light and hearing back from people on this thread: https://www.rollitup.org/t/2x-vero-29-cob-1000x-individual-diode-combination-request-advice-input.827033/#post-10477544 I've reconsidered my original plan and gone with something much...

Thanks for the advice. I guess maybe I don't really want to add an extra 300w of heat to dissipate in my cabinet. What kind of lumen output could I expect from 4 Vero 29 or 18's . Maybe I could watercool and them and keep a Tjmax of about 30c. I think for that I'd want a TDP of like 100w...

Sorry I should have been more clear. I was considering 2 of the 350W meanwell units (41-56V) I'd run 1 COB 41V/4.2A per each. They're $50ea and exceed my current requirements. Is there a good way to add the constant current regulation to each?

I'll probably add more COB's in the future. I'm thinking of arranging the red led's into 4 250 led groups, each with a COB in the middle. Obviously at first it will be 2 COB's + drivers short, but I can add them later as funds allow. So basically four sections laid out like this (with only two...

How about something like this? 48V/7.36A SMPS It says it is constant current limiting, but I don't see any current adjustment in the picture, only voltage.

Hi tightpockt, I got those #'s on the COB from table 3 in the datasheet (Product Performance atCommonly Used Drive Currents): It lists 41.3V@4200ma: Typical Flux @25C Tj: 19070 Lumens Typical DC Flux @85C Tj: 15210 Typical Efficacy @25C Tj: 110lm/W They have 4 common drive current values, and...

Maybe someone could help me take a PC PSU and step up the voltage/regulate output current on the 12V. This one: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151119 is 80+ Gold (should be over 87% efficient at any load), single 12V rail (45A continuous on one output rail, decent...

Oh Ouch: My best digikey find for COB drivers was this guy http://www.digikey.com/product-detail/en/LDB200-048SW/633-1191-ND/3078550 24V-48V 4.25A $110.35 I'd need two of them at$110ea, that's the cost of everything else combined. Anyone have experience designing high voltage...

The 1000x 630nm diodes should draw about .0458W per ea (2.4V * 20ma), and make 5-8lumens per ea. So 45.8W + PSU losses should give me 5000-8000 lumens from 624nm-632nm The 2x Vero 29's (BXRC-40E10K0-L-03) should draw 173.6 (41.3V * 4200ma), and make 15210-19070 lumens ea. So I have a total of...

Hello RIU, I'm beginning to put together equipment for my first grow. Probably not the best time to research experimental lighting, but screw it, I like electronics projects, so I'll keep on. So far I'm leaning towards using a combination, of individual diodes and Xlamp or Vero COB lights, in...