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thanks Rhaz, I think 150W is enough, its ~ 33w/sq ft.

footprint is 450mm x 850mm x 1000 height, im considering going from 6 cobs @ 700mA to 8 cobs @ 500mA - increase speead and efficiency, (money not a problem)

will 500mA produce enough intensity in a 36V vero? box is 1m tall, thanks

In your opinion then, id like 150W power total, roughly 50W / cob @ 1050mA - what cobs?!

Hiya, Im not up to date with cob manufacturers at the moment; What is considered best cob available at the moment for driving at 1400mA? Many thanks, UKP

How do the values above relate to the 2.4umols/j your talking about?

not sure what your set up is; the max voltage the molex connectors see is the Vf for the cob, not the sum of all the Vf.... isnt it?

I dont understand the link, can you explain?

Thanks for all the replies, I'll get a few more pictures tonight of the other plants in the box. Air movement is 4" in & 5" out runs 24/7 at about 60%. Verde - I'm using these nutes http://www.plant-magic.co.uk/products/soil-bloom/31/ I will get some litmus paper and check PH of feed, is...

Hi Verde, Im growing in soil so I've never thought I needed to worry about PH / EC etc.. I live in a 'hard'water area, nutes are Old Timer grow and bloom for hard water. When watering I normally mix up 2L of hot/cold straight from tap and add nutes to that. My cab is 1M high and the cobs are...

Hiya Cap, feed strength was about 1/2 the stated dose on the bottle, 2ml/l. I probably did have a over watering issue when they were younger. I've never grown under hid so I don't have much to compare to. I see a lot of red stems, does this indicate a def of some source? Any UK growers have...

Hello, Been lurking for a while, I've finished 2 grows with 4 x cxb3070 @ 700mA both times plants have suffered from some ailment about 4-5weeks into flower, I'm not sure what it is and I was hoping some of the LED guys could take a look. Cab is about 1M tall, medium is verve multi purpose...

If you had a cab, 3x2x3h what pot size would you be running? I normally grow from seed as I don't have space for mother's & cuts.

Someone check my math please: footprint 2.4*1.2 = 2.88 m2 2.88*800 --- 800 PPFD is med/high intensity level. 2304 ppf total 2304/4.66 --- 4.66 is umols/ sec emitted by cxb/vero29 per par W 494 par W--- 494 par w total is required to meet 800ppfd in 2.4 x 1.2 tent 494/0.418 0.418 is...

Wow, I wish my plants looked like that @ 3weeks! Good luck dude, hope the warm spell isn't too bad for you, Would you mind giving a few more details regarding your room set up, I too am in a loft, in the UK, albeit with 4 x 3070 @ 700mA. Cheers dude, UKP

Thanks, 3500K it is,

Hello, I have at the moment: 2 x 3000 & 2 x 3500k cxbs. I'm considering adding 2 more, this lamp will be used for vegging aswell as flowering, I assume it would be best to add 1 x 4000k & 1 x 5000k? Any thoughts or suggetions ? thanks, UKP

so my box is 400d x 900w x 950h 4 x 700mA 3070s I guess I should just aim to make the gap as big as possible thanks, UKP

Hello, Can anyone with a bit of experience suggest the min height between canopy and COB surface, running @ 700mA. thanks, UKP

whats the rest of your set up, heatsink etc.?