DiY LEDs - How to Power Them

[anarchist59]

I am using 70 volts cree cxa3590
With 2 in series. You have 140 volt
With an old seperate transformer. Rectified you have. 115ac x 1.4 = 161 volts dc

Thats a good basis to build a constant current source
All you need is an op lm358 a reference lm339 power transistor with heat sink
A few resistors and caps thats it.
It is more stable than the meanwhile stuff

 

[Blue Raspberry]

Quick stupid question here, what is the math for running a cob? Say i have a 50W Cob and want to run it a 1.4A how do you calculate how many watts its going to put out in order to match it to the driver? I know its something stupid simply that i am missing here and hate to even ask because i knew it and just forgot over time.

 

[nevergoodenuf]

Say i have a 50W Cob and want to run it a 1.4A how do you calculate how many watts its going to put out in order to match it to the driver?

You need to know the voltage that COB draws to calculate the wattage at said amperage.

 

[Blue Raspberry]

Anyone else who is looking for how to calculate it great info here http://ledgardener.com/selecting-led-cobs-matching-drivers/

 

[Godfather420]

Just wandered in! The Game is real here! Pulled up a seat! @stardustsailor and @NoFucks2Give Thank you for all you're contributions. Fckin schools in session!

 

[Shinsou]

Hi guys, was wondering if there were any tests on efficiency when running drivers to the max.
For instance I have a fixture with 4x 3590's run by a HLG-185H-C.
Now most people selling them say they consume 200-220w.
But when I crank the dimmer on the driver to the max it pulls 242w from the wall.
The light intensity increases significantly (at least visually) feels like 15% brighter compared to 220w.

Sadly I dont have any light measuring instruments so I was wondering if someone had tested it out and how much more light you get and how much worse the efficiency gets..

 

[chakup]

Iirc meanwell drivers will often push a little higher than they're rated for.

 

[Chech]

I did this & then touched the wires together to see if it worked...
A tiny little spark on the wires i touched occured then the 4 x cobs lit up...
The the first two went out and the other 2 stayed lit...
This all happend within a split second
Did i fuck my cobs?



-Do not apply AC power to a driver that is not connected to an LED string

 

[Braman]

Could some one explain me, how is efficency calculated.. that for example cxb 3590 36V is more efficient @ 1400ma or 1000ma than it is @ 2000ma. Can that information be found in datasheet or somewhere?

 

[mahiluana]

Can that information be found

http://pct.cree.com/dt/index.html

 

[Braman]

http://pct.cree.com/dt/index.html

I am looking at Meanwell driver - HLG-185H-C700A. Can i RUN just one 36V COB with this? As I understand COB will "eat" voltage as much as it needs and driver will give just 700 ma?
I mean if the min V is higher that 36V, I cannot use it for 36V COB?

Or i should just ask - what driver is suitable to run 1x 36V COB?

edit:
Just foun a driver LPV-35-36. This would be perfect for one 36v COB @ 1000ma in a aprox. feet by feet grow..just for fun and experiments

 

[mahiluana]

Can i RUN just one 36V COB with this?

No - you need min. 5 in a row of these chips to use this driver, because output voltage
is 143-286VDC .

a driver LPV-35-36

make shure your chip can stand 1000mA - and the driver will be suitable.

 

[Braman]

No - you need min. 5 in a row of these chips to use this driver, because output voltage
is 143-286VDC .



make shure your chip can stand 1000mA - and the driver will be suitable.

COB i am going to run is cxb 3590 36V.

 

[mahiluana]

cxb 3590 36V.

you find your chip here:
http://pct.cree.com/dt/index.html

If you know the binning flux of your chip (Y4 [6910] ...--->...DB [13000])
you can calculate lm / W of your lamp.

@1000mA (30% of max. current) your chip will run with a very good efficiency

 

[Braman]

you find your chip here:
http://pct.cree.com/dt/index.html

If you know the binning flux of your chip (Y4 [6910] ...--->...DB [13000])
you can calculate lm / W of your lamp.

@1000mA (30% of max. current) your chip will run with a very good efficiency

I ordered from alibaba, so the only things I know are - 3500K CXB 3590 80 CRI 36V

Is there a meaningful diference between top bin and lower bin cxb 3590? Like, they are not worth buying them?

 

[mahiluana]

a meaningful diference

the diference you can see on the same cree site.

from 100LM / W to 190LM /W --- yes there is diference !

 

[Braman]

the diference you can see on the same cree site.

from 100LM / W to 190LM /W --- yes there is diference !

Could You write an example, please?

 

[mahiluana]

http://pct.cree.com/dt/index.html

http://pct.cree.com/dt/index.html

Search for your cxb 3590 36v on above site.

Compare LM / W , total LM and others....

Then you understand why it is important to know, what type of binning flux you are buying.
Ask the seller of your cxb 3590 to get moore information !

 

[Black Thumb]

When a driver has something like this
Output Voltage V1 Nominal 27-54 V for the HLG-240H-54B does that mean it will run the board/cob between 27 and 54 volts ?

will that driver run 9x QB 288 (new 54V design) ?

 

[mahiluana]

between 27 and 54 volts ?

9 x QB 288 in paralell is close to heaven at 25W each / ~48VDC / ~200LM / W

make shure your driver always run a min. of 2 boards or better 3.

Never run a single board @ 4,45A