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Is it literally a case of soldering direct to the COB surface - standard lead based solder or SMD paste? What sort of voltage/amps will that be carrying - what sort of gauge wiring? . Do you wire them up serial or parallel?

Sorry - excuse the ignorance - 1 driver to 1 cob, or will that drive all 4?

Brilliant - all I've got to do now is decide on either active or passive cooling. Because of the size of my grow I think it's going to have to be active. I've seen lots of people on here using CPU coolers, but then you need a computer PSU to drive those. Are there any other solutions for...

Day 19 of Flower - looking good... Lovely little baby frosty...

Sorry - do you mean one cob / Sq foot?

OK - starting to get a handle on this now. What sort of footprint do you get from a COB like that?

60cm square. 400w was a gift but I realise it's overkill. Because it's so small would their be enough room for a solution that covers both V and F. I don't know if it possible to mount LED's into surface mounts and then swap out between veg and flower?

I did post my question - 60x60 micro grow. I want an LED solution to replace the current 400w HPS. I'm new to LED and want help choosing what to buy. :oops:

Hi - this seemed like the thread to ask my question - is anyone able to help?

60x60 micro scrog - 4 Critical Mass clones - 18th day of flower - 1st grow in 35+ years :???:

Hi I'm really interested what could be done to replace a 400w lamp in a 60x60 micro scrog. I'm using a wide spectrum bulb at the moment and considering going to dual bulbs at the end of my next grow so building an LED array will really work to replace that purchase. I'm competent in wiring...

Not the best picture - my first grow in 35+ years. 4 Critical Mass clones, 60x60 micro scrog under 400w HPS. End of 2nd week of flowering. Apparently this strain finishes in 7 weeks so I'm starting a count down!

Any recommendations for a nice pure Thai land race?

I've seen this thread which has been around for a few years... https://www.rollitup.org/t/free-grow-software.345468/ I've just started to grow after a break of 35 years and wondered if anyone would be interested in a new software package. I'm now medically retired but come from a software...

My small home made nursery where my clones will chill and mature for 5 weeks before main grow is finished. Made of 5mm white foamboard - learnt the hardware, make it in black and line the inside with white/reflective film. Instead I've covered the foamboard in black craft paper. Side cover...

Replaced a 125w CFL with a 65w CFL in my propagator / nursery. :clap:

I'm on a mixture of Quetiapine / Mirtazapine / Citalopram following a break down 2 years ago. Smoking helps me manage my aniexty and stress throughout the day more than any other drug I've tried. Unfortunately I've also got COPD - I guess as a result of 35+ years smoking/toking - another huge...

Latest pics

OK - EC meter - I've only really seen them at £50+, but found this on eBay... http://www.ebay.co.uk/itm/262357101972 Anyone using anything similar? Then on to PH meters I found this... Http://www.ebay.co.uk/itm/231948664632

Eek!