DIY design build throwdown

SSGrower

SSGrower

Well-Known Member
To re-iterate the importance of caution here, this switch is not actually intended to cycle on and off throughout the day, it does several things for me in the design process, primarily it frees up my multimeter to do other necessary things.
 
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PurpleBuz

Well-Known Member
SSGrower said:
According to spec max operational design temp of cree cxa3070 is 85 deg C, please correct me if i am wrong on this.
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yeah and whats that got to do with the price of eggrolls ?

I can design a light that uses active cooling that will keep a cob junction temperature at (just for example) 40 degrees C, within a grow room temp range up to 33 degrees C.

if the grow temp is less than 33C, the light will perform better
if the grow temp is significantly more than 33C, you have problems regardless..
adding a temp cutoff\dimmer switch will avoid any issues, and is probably what you would do manually using your brain. (turn down the lights when your system can't keep the temps under control.).
 
SSGrower

SSGrower

Well-Known Member
PurpleBuz said:
yeah and whats that got to do with the price of eggrolls ?

I can design a light that uses active cooling that will keep a cob junction temperature at (just for example) 40 degrees C, within a grow room temp range up to 33 degrees C.

if the grow temp is less than 33C, the light will perform better
if the grow temp is significantly more than 33C, you have problems regardless..
adding a temp cutoff\dimmer switch will avoid any issues, and is probably what you would do manually using your brain. (turn down the lights when your system can't keep the temps under control.).
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That's exactly the point.
 
ttystikk

ttystikk

Well-Known Member
PurpleBuz said:
Fans for active cooling on a light shouldn't be controlled by the temp of ambient air, they should be controlled by what an engineer determined to be safe and to provide the junction temp required within an expected ambient air range. if the ambient air is a bit cooler than expected a slightly less Junction temperature only results in higher efficiency.

Ambient air cooling in a grow room is a whole different ball of wax.
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The temp sender would be a close to the junction as possible, and would work to maintain the right temperature. If all's well, no dimming. If it creeps up towards the limit, the circuit would begin to dim the COBs, and would dim more as temps rose until finally it shuts down the driver if the chip reaches a critical temperature.

Such a circuit is simple, solid state and cheap insurance. I believe such a circuit has a place in everyone's build, actively cooled or not.
 
ttystikk

ttystikk

Well-Known Member
PurpleBuz said:
yeah and whats that got to do with the price of eggrolls ?

I can design a light that uses active cooling that will keep a cob junction temperature at (just for example) 40 degrees C, within a grow room temp range up to 33 degrees C.

if the grow temp is less than 33C, the light will perform better
if the grow temp is significantly more than 33C, you have problems regardless..
adding a temp cutoff\dimmer switch will avoid any issues, and is probably what you would do manually using your brain. (turn down the lights when your system can't keep the temps under control.).
Click to expand...
The price of eggrolls goes up if I gotta watch the goddamned temperature 24/7, round eye! LOL
 
SSGrower

SSGrower

Well-Known Member
$899 is not in my budget, not now not ever. I have absolutely no objection nor find any fault if it is within yours, quite literally more power to you, no seriously call the power company, run another 1200 amps of service.
 
ttystikk

ttystikk

Well-Known Member
PurpleBuz said:
not if you used one of the titan control environmental controls .... which is the whole point of my comments.
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I still think the temperature based dimming circuit is a good idea and not redundant.

What if the fans quit and the COBs are still running?

What if temps around your passive setup spiked for any of a thousand reasons?

It's cheap insurance.
 
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PurpleBuz

Well-Known Member
ttystikk said:
I still think the temperature based dimming circuit is a good idea and not redundant.

What if the fans quit and the COBs are still running?

.
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cutoff safety switches on a dimming circuit are certainly a good way to limit any damage to plants or lights. I use those.

But that's not what was being discussed, what was being discussed was variable dc fan control dependent on ambient temperature. wasn't it ? two different things.
 
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PurpleBuz

Well-Known Member
SSGrower

SSGrower

Well-Known Member
PurpleBuz said:
http://www.amazon.com/Titan-Controls-702760-Function-Controller/dp/B0040R6F44/ref=sr_1_2?ie=UTF8&qid=1460138505&sr=8-2&keywords=titan+fan+controller

so you can't afford $89 plus shipping and tax for a whole grow room ????
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Oh no, I got distracted and saw this
http://www.titancontrols.net/products/wireless.aspx

Seriously though for 99.99% of the people in the world these type of controls are the best option if they are at that level. I'm simply not there. This is a rabbits hole of what can be done vs. what should be done. Again, this thing is not intended to control temp. the fans still run all the time, the t-stat provides an output I can do something with (what exactly I don't know), If I knew I wanted to control a 110v ac fan or had any intent for a permanent install absafrigginlutely go with the titan instead of the open circuit board fire hazard.

BTW prices in canadian $? and 6 sq. ft is hardly a room, quite laughable to many I'm sure.
 
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SSGrower

SSGrower

Well-Known Member
ttystikk said:
I still think the temperature based dimming circuit is a good idea and not redundant.

What if the fans quit and the COBs are still running? -- Ding, ding ,ding auxiliary control I believe it is.

What if temps around your passive setup spiked for any of a thousand reasons?

It's cheap insurance.
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I don't consider this an ambient air temperature measurement if I'm reading you correctly, the temp sensor is on the heatsink.

And it is also not a Tj measurement.
 
SSGrower

SSGrower

Well-Known Member
none of that really matters what matters is the condition of the entire environment/microclimate and the parameters which you are striving for, every single one of us has different needs.
 
ttystikk

ttystikk

Well-Known Member
SSGrower said:
none of that really matters what matters is the condition of the entire environment/microclimate and the parameters which you are striving for, every single one of us has different needs.
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I'm talking about not overheating the chips themselves.
 
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