Hi Erl,Hi Kuifje,
I really appreciate the effort you are putting into making this work. Again thanks to @happy75 and you.
The driver is according to datasheet 90% efficient at full load. (Source : Website)
The ST version is not dimmable, but the DT version is. I have however not seen the DT version for sale.
Since this is my first build, i wanted to keep it somewhat simple. 1 cob pr. sqf @1050ma - a fixture with 4 cobs covering 2 x 2. Only intended for flowering.
When the fixture is working, maybe some 730nm for putting them to sleep, could be a nice add on. Maybe reflectors like pos uses.
I do like the idea about a low voltage driver and less messing with the wires. The price is great, but shipping sucks...
I have not seen any decent heat-sinks in Europe. I sure like the ones from heatsinkusa, but shipping would properly be a killer.
However I do have some boxes with some Intel P4 CPU coolers, some with copper core, some pure aluminum.
Still not quite sure if the cob holders fit on those.
I'm sure that ebay, would work just fine
Take care, and be safe
Hi,Hi Erl,
I w'd like to build some thing similar to yours , i will start with 2 x 2 tent for one plant but i think 2 cobs at 1400 mA will be fine for this area .
four cobs gives power if you operate @ 1050mA and 36 Volt will be 37.8 Watt per sqf , is it too much maybe ?
i saw some where here that 25 W per sqf gives decent results .
I believe 2 cobs @ 1400 mA will produce heat more then 4 cobs @ 1050 mA relatively ?
What do you think ?
Sorry i'm a bit confused , i didn't read too many threads about it , no time because of School .
Nice thread, it's most welcomeHave a look at this thread for heatsinks in Europe, maybe we should start another thread for drivers in Europe
BirminghamAluminium : 1000 & 9000 series are worth looking into (also calculation thermal resistance)
FisherElectronik.de : SK418, SK530 and others (thermal resistance : first value = natural convection, second value 1m/s)
Will look for the dimmable driver, really like the splitted voltage and decent efficienty
I consider 730nm a must have, will add it once the cobs are setup.
Since i'm gonna grow Durban Poison (100% sativa) i need to add extra blue and UV too, but that's for later
hey Mathias,Hi Erl,
I w'd like to build some thing similar to yours , i will start with 2 x 2 tent for one plant but i think 2 cobs at 1400 mA will be fine for this area .
four cobs gives power if you operate @ 1050mA and 36 Volt will be 37.8 Watt per sqf , is it too much maybe ?
i saw some where here that 25 W per sqf gives decent results .
I believe 2 cobs @ 1400 mA will produce heat more then 4 cobs @ 1050 mA relatively ?
What do you think ?
Sorry i'm a bit confused , i didn't read too many threads about it , no time because of School .
@Kuifje76 Thanks for reply,i really need those COB's )sorry dampfer, maybe happy75 can help you and ion1
Waiting for cobs and in my case more money to order stuff, but the closet is orderedWhats up Europeans?