Cobs Suck !!

Go go n chill

Go go n chill

Well-Known Member
DAMN! Snake eyes. I spoke too soon. I’ve got a Cxm22 that is blinking ever so often. I pulled it out of service until I can see what is up. That will definitely cause hermy issues.
 
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Redeyes82

Active Member
Southside112 said:
Just want to share my experiences with cob led's so far. So I have been running cobs in addition to other white led's for 4 years now.
Vero 29's to be exact. 4 years ago I bought a Timber 4vs which is a 400w 4 vero29 unit. I have replaced all 4 cobs already due to burning out and tonight 2 more burned out on me. 2 of the original cobs were replaced with graumaus pucks. So I have 2 pucks and 2 vero 29's on the unit. My current grow is in flower and stretching at the moment. I raised up my light like 6" tonight and got my par meter out. Turned up the power on the unit from like 60% power to like 80% power. Instantly smelled a burned electronic smell followed by flickering lights. Boom both cobs burned out and went dark. Took out the unit to much inconvenience as I have 4 flowering plants in my grow area. They were all burned up melted and black around the cobs.

Bottom line imo is cobs generate way too much heat in too small an area. 100w of cobs concentrated to an area the size of a key lime. Vero 29 cobs are the only ones to my knowledge that can run constant 100w most others run @ 50w. So this might just be a vero issue. But numbers don't lie. 6 burned out vero 29 cobs in 4 years.
I placed an order for 2 more graumaus pucks from rapid led tonight. So my unit will be a 400w 4 graumaus puck moving forward.

Never had an issue with the pucks or a 240w qb I have only cobs. So to anyone who reads this do yourself a favor and go the qb, strip or puck route. Save yourself all the hassles ive had to deal with. Thanks.
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Hps puts out more heat than cobs. I have an optic 300 veg that utilizes cobs and it’s a great light. Doesn’t put out much heat at all. Fixture is mildly warm to the touch
 
PJ Diaz

PJ Diaz

Well-Known Member
PJ Diaz said:
Heat is directly related to wattage draw, not the type of artificial light source.
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learnmetrics.com

Convert Watts To BTU: Calculator + Conversion Chart (1 W = 3.412 BTU)

Watts are a basic unit of power. BTU (British Thermal Unit) is a unit of heat. We need to convert watts to BTU when it comes to different HVAC devices (including air conditioners, furnaces, and so forth). Watt is a SI unit of power equivalent to J/s (joule per second). BTU or British Thermal...
learnmetrics.com learnmetrics.com
 
Er3

Er3

Well-Known Member
Yup..timber since 16..4 50 w cree and Dan sent a 185w driver so..don't run em wide open and use reputable dealers. Oh and pin coolers with thermal tape no fan,less heat
 
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Redeyes82

Active Member
PJ Diaz said:
Most growers have specific strategies to deal with heat. Ventilation is the primary one.
[/QUOTE for sure. Doesn’t take a rocket scientist to vent. If he’s having problems with cobs than he definitely would have had a doomed grow with hps or mh. He’s explaining what sounds to be a malfunction with the fixture. Who knows what he did when he took it all apart
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Fishbulb

Fishbulb

Well-Known Member
PJ Diaz said:
Most growers have specific strategies to deal with heat. Ventilation is the primary one.
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An exhaust fan and fill does wonders

I run 1400 watts of led so I have a 6" intake and exhaust

My dehumidifier kicks out a fair bit of heat to but my room stays at 28c max

I have to cheap office fans to move air around the room as well
 
PJ Diaz

PJ Diaz

Well-Known Member
Redeyes82 said:
for sure. Doesn’t take a rocket scientist to vent. If he’s having problems with cobs than he definitely would have had a doomed grow with hps or mh. He’s explaining what sounds to be a malfunction with the fixture. Who knows what he did when he took it all apart
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Unless you start a fire as part of the malfunction you can't get more than 3.412 btu's out of a watt, and you also can't get less than that. Physics.
 
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Redeyes82

Active Member
PJ Diaz said:
Most growers have specific strategies to deal with heat. Ventilation is the primary one.
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It’s not just a matter of watts creating heat as if watt for watt every type of lighting will produce the same amount of heat in the same space I run an optic slim 600 in a 4x4 and it most definitely doesn’t get as hot as a 600 watt hps would in same area. Heat is dealt with different. Also led doesn’t heat up the lead surface the same as an hps does. There’s differences is what I’m saying
 
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Redeyes82

Active Member
PJ Diaz said:
Unless you start a fire as part of the malfunction you can't get more than 3.412 btu's out of a watt, and you also can't get less than that. Physics.
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You’re lost off in some other shit. Why are his cobs constantly burning out? What’s your take. Why can’t he turn them all the way up? What are your thoughts? I’m saying malfunction. You’re going on about things that I’m not even talking about
 
PJ Diaz

PJ Diaz

Well-Known Member
Redeyes82 said:
It’s not just a matter of watts creating heat as if watt for watt every type of lighting will produce the same amount of heat in the same space I run an optic slim 600 in a 4x4 and it most definitely doesn’t get as hot as a 600 watt hps would in same area. Heat is dealt with different. Also led doesn’t heat up the lead surface the same as an hps does. There’s differences is what I’m saying
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Sure, it's true that there are differences in the way the heat is dispersed (ie: more direct radiant heat from HID type lighting), but at the end of the day you will have the exact same amount of heat in a tent with a 600w hps vs a 600w led.
 
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