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It makes sense then to run drivers close to their max VF output for highest efficiency. If the CXA3070 run at 350ma is matched to a driver with ~90% efficiency it would run at ~47% overall efficiency.

Thanks SDS. Good explanation. No doubt those two units will produce some awesome growth.

Cool! Two mini-Suns. I am wondering why they draw 85w each? The Vero 18 needs 28.4v @700ma or 19.9w for each emitter. Power supply loss?

"Plants just love 'plain' white ..." I couldn't agree more. After all, everything on this blue/green marble evolved under white light of varied Kelvin. The value of using what works cannot be overstated.

I really like the 3500k Vero. It's the Goldilocks of the Vero line for flowering. As with all of the whites, a bit of supplemental blues and deep/far reds is needed to hit all of the chlorophyll A & B peaks. The 3500k Vero as the only light source should work very well. Supplemental reds and...

The only thing I can think of in terms of stress is that the tops will bleach if the light is closer than about 5". I also had to increase the amount of Magnesium but that is partly due to the RO water I use. The plants seem to need more Mag with the higher light intensity. I use more GH...

Thanks! No snow. That's a 5" fence post root chamber with the walls and floor painted white. What you see in the net cups is some polyfill quilt batting. I line the cups with it and them fill around the rooted clone with growstones and more polyfill. It's cheap and provides a good mix of...

It's the magic of side-lighting. MM regs here only allow a max of 6 plants with only 3 in veg. With my space and regs limitations I felt compelled to maximize where I could. I run perpetual so I have one in a 2x2 tent and veg 2 plants in a 2x4 tent with 2 in the open flower area. That way I...

It has 6 chanels. One for each of the 5 strings of 3 Veros +2 stars and one for the 660s. My last run was 15.3 ounces. Not too bad for 6 square feet. It has a lot to do with the 96 Cree CXA1304 cobs surrounding the plants in the other 4 levels of bars. They're the 9v version slightly...

I recently upgraded my overhead light from Vero13 to Vero18. More lumens while using less power. I figure ~20% efficiency gain overall. I see that you're using 3500k. My light is mostly (9) 3500k. It also has 2 5000k and 4 2700k. I think 3500k is a great choice for flowering and I could...

That would work just fine. The 670nm Cree photo red has the edge. I bought my deep reds before they were available so I use Luxeon ES 660nm deep reds from Steves Leds.

If I were building a light for 2mx2m coverage using 6 Vero29s, I would use 6 separate 100w or higher rated cpu coolers, drive them at 100w which is about 2.5a. One driver per emitter. Those 6 lights would make about 72000 lumens of choice par light for around 600 watts consumption. With...

~80w of led is a rough equivalent of 100w of hid as a rule of thumb. Some better, some worse but it's close. The 420w led light you are suggesting would definitely outperform a 400w hid. To get more light you could either add more emitters at the same or lower amperage (best choice for...

Sorry, I didn't read your original post thoroughly. 420 watts may not be enough for that size of space. Adding the Cree 660 reds would work well. It's best to have them switched separately so as to avoid excessive stretch in early flower.

420 watts covering 4 square feet is a bit of overkill. You could easily run them at 50w each and still have more light than needed for 2x2. It would also run cooler and produce more lumens/watt. All 3500k would work just as well as mixing 3000k and 5000k.

Thanks Goud, I now remember reading the thread but had forgotten about it. The comparison of the 2700 and 3000k Veros is impressive for the 2700k.

I wish Bridgelux would provide more detailed information on their 2700k Vero. It would make choosing easier! They do have a graph for their 'decor' chip but I don't think its the 2700k. At least they don't say it is. That one appears to have more and deeper red but seems to be unavailable.

The graphs provided by Bridgelux don't include the 2700k so its a mystery just how much more deep red it makes than the 3000k. You may want to consider using 4 of them and run them at 1000ma. Running them softer has the advantage of running cooler and producing more lumens per watt. 4 at...

Vero chips are great. A little less efficient than than the cxa 3070 but they're still pretty darned good and the price is easier to swallow. The 2700k or 3000k will both be good for flowering.

I vote for all 5000k. That's what I use for both my mother and veg and it works very well. They grow well and don't stretch a lot. I use this Philips bulb http://www.homedepot.com/p/Philips-120W-Equivalent-Daylight-5000K-PAR38-Dimmable-LED-Flood-Light-Bulb-425280/203553286 with the lens...