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mitch_buchanon

New Member
CobKits said:
no

cob will not run at 28.6 V

you need to pick a target current, look up the voltage from the datasheet (1212s are jsut over 36V at 1.4A)

then if you want to run 4 cobs you need 36X4
if you want to run 5 cobs you need 36X5

you have a little leeway but not much

for example 36X4 = 144V. if the driver give 143V that works. it may or may not dip the current output a bit.

but the absolute lowest you can run a 1212 is about 32V (and thats at a mere 0.1-0.2A).

under that they wont light up at all, and its questionable what the driver would do if youre trying to provide 1-1.4A at a voltage significantly under 36. (say 33-35.5V) they might flicker and never light up. better to have a little spare voltage than be right there

all that assumes series wiring with constant current drivers

you can read more here
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Thank you for the response, i undestand so i have an extra cob and i forgot to ask for another holder, is there any way to modify an order that still show processing?. I would like to change it, probably ask for a few heatsink.
 
Buck5050

Buck5050

Well-Known Member
@CobKits I have been looking at your light engines and wanted some confirmation. I have 8 eb gen 2 strips running in series on an HLG-185h-c1050b and was wondering if I dropped one strip from the circuit would I be able to add one of your luminous lite engines to that? Forward voltage on the strips are 19.5-20.5 and I believe the drivers max voltage is 190v from the data sheet.
 
CobKits

CobKits

Well-Known Member
sounds like it should work. at 1050 mA they are 51-52V IIRC

it will be tight though, depends on the actual voltage of your strips
 
Buck5050

Buck5050

Well-Known Member
I just tested the circuit and one meter read 138v and another 138.7. I think I should go for it since it's so close. I heard these meanwells are superb drivers and being that close I suspect it should work out. Taking the plunge and ordering 2 each of your 120mm engines and reflectors you should see the order come through shortly.
 
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S

Smokeymcfattie

Active Member
Pulled the trigger on 6 1212s and hlg-320 c1400b. If wiring in siries this should work correct? Is this enough for a 4'x2' space. I'm replacing a 600hps because of heat issues. Hope this helps. Cobkits not taking RUI discount anymore?
 
CobKits

CobKits

Well-Known Member
Buck5050 said:
What does "processing" on order status mean? I hope this doesn't refer to payment status.
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dont mind that. usually ships same day

Smokeymcfattie said:
If wiring in siries this should work correct?
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thats the only way you canwire with those drivers

Smokeymcfattie said:
Is this enough for a 4'x2' space. I'm replacing a 600hps because of heat issues. Hope this helps.
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should work great

Smokeymcfattie said:
Cobkits not taking RUI discount anymore?
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not active right now, sorry
 
N

nosytanonymous

Member
Hi there, fresh to the DIY game.

I am hoping to nicely fill a 3x4 area. Will these will put out enough light..

After doing some research, I have narrowed my search down to;


2x clu058 - 1825 (Would like to try out the 3618 but after driver and everything it seems a little pricey for my first build)
1x Meanwell HLG-320H-C2800B

I have found two heatsinks on ebay which I plan to attach them too - will these be big enough to run without an attached fan?


Not sure if a lens will help or if any are available?

Some cob holders would be nice too if anyone has a link..

Is there anything else I'm missing?
 
N

nosytanonymous

Member
CobKits said:
base of those heatsinks is too thin for cobs in my opinion, esp 1825s
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I see the ones you stock are 10mm. Looks like these are about a 1/4"


Might have jumped the gun on the heatsinks. I would still like to use them if possible. They will be inside a tent with moving air. What cobs would you recommend?
 
B

benniehanas

Member
@CobKits I am going to run 8 1825s at 75w each in a 5x5. What difference in par do you see out of a 50 watt 1825 cob compared to one that's ran 75 or 150 Watts? I'm wondering if I build this how far from the lights should my canopy be. I was thinking at least three feet.
 
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