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GrowLightResearch

GrowLightResearch

Well-Known Member
nfhiggs said:
You are simply ridiculous in your inability to grasp this very simple and BASIC concept. The CC driver controls the load's current by varying it's voltage output as needed. If the loads temp increases and resistance drops, the driver adjusts the VOLTAGE downward to maintain the current at the same level. Do you not understand the fact that current in a load is the direct result of applied voltage? This is really VERY basic stuff.
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Like I said "You obviously do not have the background to argue this". for further information re-read previous post.

I am a retired very accomplished electrical engineer that first worked on military grade switching power devices in 1979 at Airpax located in Sunrise FL. In retirement I am currently designing LED CC drivers.

The only requirement of a CC driver is it's input voltage be greater than the LED Vf.

The LED at issue here is an LED that has a Vf that ranges between 30.3v and 38.5v driven by a n600 watt HLG-600H-36 with an output voltage from 30.6v to 37.8v.

With a max current output of 16.7 Amps that will smoke a Citi 1212 in a millisecond if connected with out the HLG being current limited.

Just stop! You are in way the fuck over your head on this topic.

Have you not fucked up enough threads on this site with your idiotic bullshit? Just STOP!!
 
nfhiggs

nfhiggs

Well-Known Member
GrowLightResearch said:
Like I said "You obviously do not have the background to argue this". for further information re-read previous post.

I am a retired very accomplished electrical engineer that first worked on military grade switching power devices in 1979 at Airpax located in Sunrise FL. In retirement I am currently designing LED CC drivers.

The only requirement of a CC driver is it's input voltage be greater than the LED Vf.

The LED at issue here is an LED that has a Vf that ranges between 30.3v and 38.5v driven by a n600 watt HLG-600H-36 with an output voltage from 30.6v to 37.8v.

With a max current output of 16.7 Amps that will smoke a Citi 1212 in a millisecond if connected with out the HLG being current limited.

Just stop! You are in way the fuck over your head on this topic.

Have you not fucked up enough threads on this site with your idiotic bullshit? Just STOP!!
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You are one spewing idiotic bullshit, and fucking up threads.

Voltage produces current. Its that simple. Stop conflating terms like Vf with applied voltage across a load. I don't give a rat's ass WHAT you've designed or how many degrees you have. Design whatever the fuck you want, you STILL have it backwards. Current through a device is determined by the voltage applied across it, and its resistance. Current will ALWAYS be regulated by varying the output voltage. And output voltage is regulated by allowing the load current to vary. Very simple concepts.

37.8 volts is simply not enough voltage to produce enough current in a Citi 048-1212 COB to even hit it's max rating of 2650 mA, much less "smoke it in a millisecond". If you allow it to heat up to 100C you STILL only get it to slightly above its max current rating.
 
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PurpleBuz

Well-Known Member
GrowLightResearch said:
The HLG is definitely a CC driver. The HEP is a CV power supply.
All CC drivers have a voltage range where the CC does not work.

The HLG-36 can provide up to 37.8V. Between 36 and 37.8V the HGL will output max current if not limited with a resistive load or by the dim control.
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You are WRONG the MW HLG-600H-36B is a CV + CC driver. The driver will only increase the current until it hits the voltage limit around 37.8 V.

nxsov180db said:
So if I hook up 1 Citizen 1212 to a MW 600H-36B it will only draw 1800 ma? The COB won't be immediately over powered and burn out?
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At 37.8V the current will not be high enough to burn out the cob. You need to back off and understand what is being said here and return to fundamentals. Voltage and current as supplied by a driver are directly related and tied to each other like a see saw. remember Vo X Io = Watts
 
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nxsov180db

Well-Known Member
PurpleBuz said:
You are WRONG the MW HLG-600H-36B is a CV + CC driver. The driver will only increase the current until it hits the voltage limit around 37.8 V.



At 37.8V the current will not be high enough to burn out the cob. You need to back off and understand what is being said here and return to fundamentals. Voltage and current as supplied by a driver are directly related and tied to each other like a see saw. remember Vo X Io = Watts
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Are you saying at 37.8v the cob itself will only take or accept so much current? ..because the driver will put out over 600 watts that that voltage.
 
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PurpleBuz

Well-Known Member
nxsov180db said:
Are you saying at 37.8v the cob itself will only take or accept so much current? ..because the driver will put out over 600 watts that that voltage.
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no the HLG-600H-36B will not put out the full spec'd 600 watts with one citizen 1212. The voltage will be capped around 37 - 38 volts and the current will be around 2000 ma. The driver can't raise the current any higher because the voltage is being limited.
 
GrowLightResearch

GrowLightResearch

Well-Known Member
1212ham said:
PLEASE people, let's stop highjacking this thread! GrowLightResearch started another thread for this argument!
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It's okay, I'm fine with how it is going. So far I only care that you get the correct information. For too long there was no one to stand up to these guys that are the blind leading the blind or have been lead down the wrong path by the blind. Just maybe some of them will get it.
 
nfhiggs

nfhiggs

Well-Known Member
GrowLightResearch said:
No. Because the 36v driver is inadequate to drive the CoB to its max operating current that statement is no longer valid.
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Come on, you can say it..... I'll help you. Just repeat after me : "I..... was.... wrong.... and..... you..... guys..... were ..... right." There. Now, was that really so hard?
 
GrowLightResearch

GrowLightResearch

Well-Known Member
burnpile said:
Is this the correct pot for dimming with a meanwell b driver?
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It will likely work. It's a very fair price. I have purchased various things from uxcell and they are okay. The drawback is you may have issues with resolution. It is a single turn pot which means you have one turn to adjust the current from min to max. This is more of a job for a trimmer pot with multiple turns. The more turns equates to more resolution.

A single turn will be a bit of a pain in the ass if you want mA resolution. I use HLGs in my lab and adjust the current using my bench power supply. It has two single turn pots one for course and fine adjustment. And still it's a pain in the ass. But in the lab I usually need to use exact mA value.

I like to know the minimum resistance of the pot. Not a big deal in this app but it is possible the minimum resistance could be 10% of the rated resistance. More common is 3% or so but when it's not stated that's a red flag for me. 10% would take you to just below 10% of max current. Also you will very likely not be able to turn the LEDs off with this pot. I believe the MW datasheet tells you the circuit required to turn them off. A timer will remedy that.

If you can, narrow down your current range to less than min to max.

If you want full min-max power capability. Use a 200,000Ω resistor and a 200,000Ω pot.
This trimmer will give you a little dampening (better resolution) in the higher amperage range.

The best way is to choose a min Ω and max Ω value. Choose one resistor for the min Ω value and the other value would be calculated (max Ω - min Ω ) x 2 = max resistor value and pot value. The resistors are connected in series and the pot and resistor of the same value as the pot (max) are are connected in parallel. The pot then will only operate between the min and max currents.
 
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