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With constant voltage drivers you get problems with the output voltage not being exactly the same so 1 psu with supply more of the load when run in parallel. In series you need to make sure both supplies can handle the series current. Currets add in parallel.

Its forward volts x current in amps for the device. Vero 29 Vf approx 38 at a current of 2.1 amps

Would be interesting to see if it could drive a vero 29 at 2,1 amps. A little more Vf and it would manage I suspect.

I think the Vero is a good starting point for a first timer as they are a little more robust machanically than the Cree. You can get plug in connectors for them to avoid soldering and you don't need holders.

I don't know if a duct fan would do the job or not, but it is better than no fan.

Dunno how I came up with the 30 watt/sqf last , must have been dreaming lol. You want around 30watt per sqf, you have approx 7 so 210 should be enough. 4x Crees at 1.4 would work nicely, or 4 vero 18 @ . Stick with 3k spectrum. If driving chips hard the Veros are better, if going soft then...

A lot of Chinese made stuff is very good. Volvos etc.trouble is sorting the good from the bad. Those lights earlier could be ok but from my experience the ones I bought were slapped together very poorly which is largely why almost all failed within 6 months. I think after 12 months I had 2 out...

I think I have had too much morphine tonight but that makes some sense, at least for now . Remember no real idea about plants but I do know a little about engineering. If a plant uses red and blue more efficiently but needs other spectra for optimum growth it kind stands to reason you would...

I've tried the cheap China bulbs, spots and those things both in a grow and house. MTBF is abour 6 weeks :;)

g/watt is hard to believe unless using to measure your own grows. Very easy to cheat run the light for 24 hours divided up into 2 12 shifts, double the yield same light :)

You could run each Vero 18 up to around 60watts, with 1400mA drivers they will run around 40 watts. Price of drivers goes up a bit if you want to run them at 60 watts, sorry I haven't recently looked for a suitable driver. You would want one that puts out 2100mA with a Vmax of say 36Vdc for...

Vero 10s are around $4 each and put out a lot more light, thus less work for DIY and cheaper in the end I guess.

Maybe he doesn't live in the USA and not concerned about suing ;) I've used these without issue but beware they are open frame http://www.aliexpress.com/item/5pcs-100W-Constant-Current-LED-Driver-AC100-250V-to-DC30-36V-3000mA-for-100W-High-Power/1305956043.html

With a budget of 150 you could get 2 vero18 and a driver plus a couple of CPU heatsinks. run them @1400mA. CXA ab bins are going to cost about 60 each so it would be a little more efficient but it will blow your budget I suspect. Vero 18s are around 12 each, 1.4 amp ebay drivers (approx 12...

I've been there and did it. I can say 600w of those multichips will out perform a 600w hps watt hps by a little. In saying that I am starting a new grow soon with veros good luck.

What sort of light. I'm guessing you need more light. I think they will be ok. let them dry out a little

I'm a little disappointed that I could't easily find 2100mA drivers for 2 Vero 29s in series. I could of course use separate drivers for each vero 29. In my last setup I had separate drivers for each led but the cabling inside the tent becomes a real mess which is something I would like to...

I will go with Veros to supply the bulk of light. I am still having a problem deciding which Veros to use. Vero 13s would be great for spread running at 700mA. They are also very good price wise, what may kill it is the amount of work required to make a decent panel out of them given 4 vero...

Ok after posting in a few threads here I've decided I had better make my own thread to keep all the info together. I had to move last Oct to a new country for work. I'm a contractor so while I will be here for another 9 months or so, this wont be my permanent home. For this reason I didn't...

you can get photo red of stars here http://www.led-tech.de/en/High-Power-LEDs-Cree/CREE-XP-Series/CREE-XP-E-Photo-Red-on-Star-PCB-LT-2296_120_138.html, bit pricy though @ around €5,50 sorry for the slightly off topic post. I will start a thread :)