HLG-240H-42B

[salmonetin]

...HLG top line CC + CV driver... maybe one of the best to try the paralell way... you can adjust both output values...
...but its only mine inexpert opinion... ...the general recomendations its runing on series... but with good drivers CC+ CV... good heatsinks... and running soft or medium... i think we can go asuming some risk... on high values you assume more risk too... from my inexpert pov too...

pd... off course not for kids or novels...some skill on electricity security its assumed... ...lol...danger mr robinson... pay lot of attention on what you do....

pd 1... i saw faults on fuse protections... led fried... fuse not protect too well...maybe slow response fuse... maybe with faster response fuses better protections...attention to the time response for fuses on leds protections...



Saludos

 

[ttystikk]

So what I'm getting from this discussion is that parallel circuits of COBs are possible and safe if the circuit can be made safe in case of a COB failure. Making the circuit safe means ensuring the other COBs on the same circuit don't overheat, correct? Lots of ways to skin that cat!

 

[PurpleBuz]

. If you want to experiment first, use the generic cobs. .

but wouldn't generic cobs have a significant chance of failure, and thus hit worst case scenario ?

Are fuses fast enough to prevent worst case ? other solutions ?

 

[bicit]

So what I'm getting from this discussion is that parallel circuits of COBs are possible and safe if the circuit can be made safe in case of a COB failure. Making the circuit safe means ensuring the other COBs on the same circuit don't overheat, correct? Lots of ways to skin that cat!

I thought it would be worth mentioning that the the ideal holders for the CX series has two ports for wires on both the positive and negative terminal. I also can't find any documentation regarding the CX series and warning against parallel circuits.

 

[salmonetin]

I also can't find any documentation regarding the CX series and warning against parallel circuits.

...Pages... 21 – 23...

http://www.cree.com/~/media/Files/Cree/LED Components and Modules/XLamp/XLamp Application Notes/CXA_design_guide.pdf

ELECTRICAL CONSIDERATIONS

Multiple CX Family LEDs

If multiple CX family LEDs are used in a luminaire, it is best to configure the LEDs in series, not parallel, or use a multi-channel driver.

Electrical Overstress / Hot Plugging

Electrical overstress (EOS) occurs when an LED is exposed to any current exceeding the maximum current specified in the LED’s data sheet.

The effect on the LED varies in severity depending on the duration and amplitude of the exposure, however, any single EOS event has the potential to damage an LED.

This damage can result in an immediate failure or in a gradual failure many hours after the event.

A number of EOS protection devices are available to absorb electrical energy that would otherwise be dissipated in the LED or to block current from flowing in the reverse direction if the load is connected backwards.

A good way to avoid EOS is to use a good quality driver, such as one from a Driver Solution Provider listed on the Cree website or from a supplier that participates in the Driver Compatibility Program (DCP).

Cree recommends adding EOS protection to luminaires that do not include an on-board power supply.

The use of a simple, low-cost protection circuit can dramatically reduce the rate of returns from lighting customers.

EOS, and hot-plugging in particular, is the most common problem Cree has observed in returned LEDs.

In addition, Cree recommends extensive testing of LED luminaires that includes surge immunity, power cycling and electromagnetic compliance.

Some steps to prevent EOS events at a work station or assembly line include:

• Connecting a metal table to a common ground point

• Anti-static wrist straps for personnel

• eSD table mats

• ESD floor mats

Additional information on EOS can be found in the EOS and Pulsed Over-Current application notes.

http://www.cree.com/~/media/Files/Cree/LED Components and Modules/XLamp/XLamp Application Notes/XLamp_Elec_Overstress.pdf

http://www.cree.com/~/media/Files/Cree/LED Components and Modules/XLamp/XLamp Application Notes/XLampPulsedCurrent.pdf

Reverse Voltage

CX family LEDs must not be energized with reverse voltage or catastrophic damage will occur.

The LED can be protected by placing a barrier diode in series with the LED.

Observe correct polarity when connecting a CX family LED to a driver.

pd...SDS point us with the inrush currents for led drivers too.... ...good point too,,,Thank again SDS...



Saludos

 

[bicit]

...Pages... 21 – 23...

http://www.cree.com/~/media/Files/Cree/LED Components and Modules/XLamp/XLamp Application Notes/CXA_design_guide.pdf

ELECTRICAL CONSIDERATIONS

Multiple CX Family LEDs

If multiple CX family LEDs are used in a luminaire, it is best to configure the LEDs in series, not parallel, or use a multi-channel driver.

Electrical Overstress / Hot Plugging

Electrical overstress (EOS) occurs when an LED is exposed to any current exceeding the maximum current specified in the LED’s data sheet.

The effect on the LED varies in severity depending on the duration and amplitude of the exposure, however, any single EOS event has the potential to damage an LED.

This damage can result in an immediate failure or in a gradual failure many hours after the event.

A number of EOS protection devices are available to absorb electrical energy that would otherwise be dissipated in the LED or to block current from flowing in the reverse direction if the load is connected backwards.

A good way to avoid EOS is to use a good quality driver, such as one from a Driver Solution Provider listed on the Cree website or from a supplier that participates in the Driver Compatibility Program (DCP).

Cree recommends adding EOS protection to luminaires that do not include an on-board power supply.

The use of a simple, low-cost protection circuit can dramatically reduce the rate of returns from lighting customers.

EOS, and hot-plugging in particular, is the most common problem Cree has observed in returned LEDs.

In addition, Cree recommends extensive testing of LED luminaires that includes surge immunity, power cycling and electromagnetic compliance.

Some steps to prevent EOS events at a work station or assembly line include:

• Connecting a metal table to a common ground point

• Anti-static wrist straps for personnel

• eSD table mats

• ESD floor mats

Additional information on EOS can be found in the EOS and Pulsed Over-Current application notes.

http://www.cree.com/~/media/Files/Cree/LED Components and Modules/XLamp/XLamp Application Notes/XLamp_Elec_Overstress.pdf

http://www.cree.com/~/media/Files/Cree/LED Components and Modules/XLamp/XLamp Application Notes/XLampPulsedCurrent.pdf

Reverse Voltage

CX family LEDs must not be energized with reverse voltage or catastrophic damage will occur.

The LED can be protected by placing a barrier diode in series with the LED.

Observe correct polarity when connecting a CX family LED to a driver.



Saludos

Dunno how I missed it. Thanks again.

 

[robincnn]

About a year ago I bought an HLG-240H-42B and couldn't return it.
So I'm wondering what it could be used for in the grow light arena.
Or if someone has a use for it?

Since you mentioned grow light 'arena'
I would find the big best heatsink and run a single Vero 29 to see how far it will go.... At least until the case temp reaches 105 degree c. Even at this 105 temperature the efficiency may be low but its 10000hr lumen maintenance is over 96%. Too bad cree is no match in this deadly arena.

but wouldn't generic cobs have a significant chance of failure, and thus hit worst case scenario ?
Are fuses fast enough to prevent worst case ? other solutions ?

I think in parallel the fuse should be fine. Keep many spare fuse. to keep in mind if one fuse out, current increases in others, all others might go out too.

 

[SupraSPL]

That was with 5 V29 (2x 1.2, 3x 2.0). I don't remember the exact values, but it was 230 Watt on the multimeter. Even after power factor correction (*0,95) that is too high for the predicted ~191 Watt of cob dissipation. I have to admit that my cheap energymeter showed 215 W actual draw which has the (previously measured) 3,4 Watt for 5x Actic11 included. That would make up for 90,3% efficiency. It still bothered me, somehow, spending huge amounts of money on those extra percentage points just realising there is room for variation even in quality parts. But that feeling then left soon seeing the actual results

Did you check the current output with a DMM? The Mean Wells often put out more current than they are rated for, especially the A versions it seems. When I tested HLG-185H-C1050A it put out 1150mA. My HLN-80H-36A is supposed to put out 2.3A but it puts out 2.55A. Sorry for the off topic but seems important.

 

[Rahz]

Since you mentioned grow light 'arena'
I would find the big best heatsink and run a single Vero 29 to see how far it will go.... At least until the case temp reaches 105 degree c. Even at this 105 temperature the efficiency may be low but its 10000hr lumen maintenance is over 96%. Too bad cree is no match in this deadly arena.

Looks like at 5.7 amps it would be right at 42 volts, about 190% of nominal output 18000 lumens, 75 LPW. lol

But, it has B designation dimming, so I could turn it down to something reasonable... thanks for the idea. I've been wanting to build a lamp for my shop so this could work.