Introducing CobKits.com - specializing in DIY and Citizen COBs
TurkishRambo
Member
Yep. Should think about lower height. Thanks again.
boilingoil
Well-Known Member
Thanks, and sorry for all the questions. I just think they sold me the wrong caps or something. 100k pot drops my amps to a max of 700mA when turned all the way down an still shows 700 ohms resistance on the pot.
Doing the math I should only need around 40 ohms to cap my drivers output to 2.8A from 3.3A running 4 chips.
CobKits
Well-Known Member
look at the datasheet it will tell you the exact % of dimming for a given resistance
thetr33man
Well-Known Member
Looks interesting, where do you get those?Looks like 500m3 fan blow air good thru mine 90cm cooltube. So my point was to use only main fan without any 12v fans. Tube should look like this but with plastic top part:
TurkishRambo
Member
From some local russian manufacturer(1radcom). With ~40$ per meter cost. Even cheaper than CPU-coolers i was plan to use first.
swedsteven
Well-Known Member
Wath will be the umol/j if i run
1212 gen 5 at 5watts ?
10 umol /joule
Best efficiency !
That mean we need 4 time less watts achive same ppfd
40 1212 at 5 watts each will provide
2000 ppfd 200 watts ! And i dont think it will need heat sink .
1212 gen 5 at 5watts ?
10 umol /joule
Best efficiency !
That mean we need 4 time less watts achive same ppfd
40 1212 at 5 watts each will provide
2000 ppfd 200 watts ! And i dont think it will need heat sink .
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swedsteven
Well-Known Member
CobKits
Well-Known Member
thats not accurate.
10.4 ppfd/W is arbitrary to my test and has no relationship whatsoever to your space. i have other tests in my sphere where the numbers are over 40 ppfd/W that doesnt mean there is 4X more light
swedsteven
Well-Known Member
Ok but can u tell me how much umol/ watts will it provide at 5watts a 1212 gen 5 3000k 90cri ?
ill be interest in building a setup that i could dimme 400watts to 200watts to have the best efficiency with 40 cob on to a 3' by 3' metal or aluminium board and a meanwhell 400?dimmeble
Even the driver and cob will last longueur if dimmed right?
ill be interest in building a setup that i could dimme 400watts to 200watts to have the best efficiency with 40 cob on to a 3' by 3' metal or aluminium board and a meanwhell 400?dimmeble
Even the driver and cob will last longueur if dimmed right?
CobKits
Well-Known Member
look up the old "cheap and cheerful" citizen thread, it had umol calcs for all the different spectrums. you can then use the chart above to estimate the relative umol/J based on those currents and your current. you can also use the citi calculator but thats in lumens not umols. either way you are guessing on temp effects
swedsteven
Well-Known Member
let say gen 6 1212Wats better 5watts 50 watts 90watts each cob
swedsteven
Well-Known Member
I will love to build a "cob board" that beat all those other board lol 200 watts at 2080 ppf @energystar
Less cfm outake needed to up temp and dehumidificator .
50 cob at 5 watts each dimmeable to 10 watts each to match qb
just ad to spread those 50 cob to make it even and keep them closer to canopy .
Less cfm outake needed to up temp and dehumidificator .
50 cob at 5 watts each dimmeable to 10 watts each to match qb
just ad to spread those 50 cob to make it even and keep them closer to canopy .
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swedsteven
Well-Known Member
Will it be possible to run 50 cob 1212 at 5watts each and be able to dimmed up to 10 watts each ?
if yes wich driver will match that .
And will it be logical to do that or pratical
if yes wich driver will match that .
And will it be logical to do that or pratical
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Why not get some QB 132's no heatsink needed and put on frame.....? cost much better.....think your coverage is going to be better ?
swedsteven
Well-Known Member
To reach the best efficacy ppfd/w
49cob on a 4' by 4' metal plate
no heat sink no frame
490 watts dimmeble to 245 watts
Ill be able to keep the cob at about 4 inch to 6 inch and get the best coverage and high umol at the canopy with low wattage just to build the best !
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OneHitDone
Well-Known Member
I just can't wrap my head around this idea. I mean my plants will grow half of your lighting distance to canopy in a single night
