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No. I have TIG welded regular 304 stainless (not extra-low carbon 304L,316L) to copper and it has been in service in an acidic wet environment for many years with no issues. The joint is washed down 5 times a week with chlorinated tap water. Almost every refrigeration unit has copper tube...

OK, spent more time and money than I thought of course. The copper was scrap so purchased by weight. I picked up an additional 25 heatsinks plus 2 150mm fans and some other parts for $20 cash. This is a 17" x 11" x 1/16" (about 1.6mm thick) piece of scrap copper. It was very shiny until I tried...

On the home stretch of my build. What is an inexpensive method of powering / driving three strings of "2-3w" LED's and having them dimmable for supplemental spectrum for a Vero 29 4,000K cabinet? For my requirments, from least important to most important... string 1, for that end of day effect...

Any ideas out there for a micro sized light mover for using with a COB LED fixture? Only looking for about 6" of travel. I've never tried growing with LED's before but imagine there would be hot spots. Anyone can benefit from moving lights if done right. The problem with some is too much time is...

yep... not denying there is chinese crap sold through the internet, moderate chinese crap, and made in china under somewhat strict supervision for the peoples republic's best interest - high end Cree... I'm putting one little 30W china blurple in the middle of my 4x vero 29 (wish I would have...

2x3 footprint, think there is 4' from growing media top to bottom of light. I've been playing around with shapes on the tile floor to figure out how to spread the following: Main source of light is 4 x Vero 29's at 1050mA. I have one blurple COB, probably running at about 22W in the middle. I...

The suggestions to go with HPS are good but I wouldn't bother with anything smaller than 600W if I were to do a grow. Smaller sizes are not efficient. You just can't really get into LED for cheap. I've killed perfectly healthy plants in two days with cheap chinese stuff. I couldn't tell they...

That's the idea, I suppose I could use u channel and put them on the sides as well? For solder, I think I'm using 0.030 , Kester with 37 / whatever with rosin core. May have missed my chance to get a larger sheet... ah well, would have cost money... but I have some bar stock and angle, so could...

wow, in time I wrote this there was the awesome 4,000 cob grow a few posts up. Nice stuff, sorry to follow with this garbage! I'm aware most stuff made in china is crap. No need for saying sorry! Pic of china COB mounted to solid copper heatsink with heatpipes. Note I don't have a fuse, not sure...

<quote>the Chinese cobs that I am familiar with burn out all the time, most in a year or less. I know I have a pile of Chinese cpb lights being recycled for parts. They belong in the garbage bin. </quote> ok, haven't figured the quote thing out... I just finished my single $21 30W blurple...

Yes, easy to be ignored here for mentioning the use of "full spectrum" chinese cob's. The conversation doesn't seem to allow for their use in combination which is where they may have a use. No doubt the chinese stuff is lacking in spectrum ranges as presumably experienced growers have commented...

Opinions on using a 1/4" plate with CPU heatsinks on top of it? I'll have some air circulation up there but not going for full on active cooling. Probably a 120mm fan per bar running at 7v? Today I picked up 25 surplus cpu heatsinks, two 140mm fans and two 18v 65w laptop power supplies from a...

answered my own question below... I have a chinese power supply / cc led driver for driving a chinese cob. Input wires for AC are brown, yellow, blue. Don't know what goes to what for 120 volt AC. Input is listed as 90-266V AC. Output states 36V 900mA Anyone know the answer for wire color? Is...

I have pretty much settled on 5x Vero 29's on a 1050mA driver, color of 4,000K for a 2x3 cabinet. The cabinet is built and running with cheap CFL's and LED's. Last decisions: COB holders because I want to be able to easily change reflectors. What gives the most options? I can solder, drill and...

oops, typo error, should have read 1050, not 1500

am I correct that the hlg 185h-c1500 with 5 Vero 29's should be using about 189 watts? I couldn't find specifics on lumens for 1.05A below is modifying some data bigyellowcob had given me when i first started looking... no idea where these figures come from, but tried to fill in what looked...

trying to finish up an order hlg-185h-c1050 5x vero 29 4000K I could solder, but to keep things simple... 5x (?) 0688014085 molex 12" pico ezmate harness what is used to connect from the mean well to the first cob? drill and tap holes in heatsinks... -thanks

Thank you Different scale? Even if so, can try to draw conclusions. Am I mistaken or is that a slight edge to the Vero's in the red spectrum? Had to print them out in B&W and use my strongest reading glasses. ... No, got that backwards... Cree actually has better spectrum and efficiency? You are...

I do know how to grow, I don't know what it is like to grow under LED's. Review / Suggest Vero build: 2x3.1' footprint, 45" from light mounting bar to top of growing media. Take out 4 inches for height of fixture, ideal to keep tops of plants 10" from lights which will let me grow 31" tall...

That is awesome data! Are those the $88 chips or higher? Guess it is an ask and receive... in middle of writing a post in the "help choosing led" thread, near post #7000 Is there similar info for those of us who can only afford Vero COB's? Anything compelling enough to make one buy currently...