Lighting 39V 2.1A COBs good/cheapish drivers?

[wayward1]

These aren't correct E numbers. I have seen on another forum 5-9% lower. Same CRI, same colour, same wattage, Vf etc... But not E.

Is it just me or do I get (with very good intentions) wrong information posted? and when I factor in my f ups, life becomes hard when your trying to configure a tailor made set up. So can anyone answer this... (very simple question)...
What is the product number of a citizen clu048 3500k 90cre and what is the forward voltage? Sound simple? It's got me confused! Lol!

 

[Rapha El]

http://www.digikey.de/product-detai...-353H5K2/1642-1359-ND/5973743?cur=EUR&lang=en

 

[wayward1]

http://www.digikey.de/product-detai...-353H5K2/1642-1359-ND/5973743?cur=EUR&lang=en

At 34.6 volts? I thought they ran at about 36 which can be important for the vf of the driver

 

[Rapha El]

page 6.. if you put 2.8a in you need 39volts

 

[wayward1]

Nope. Not getting it! Do the volts change in relation to the amps it's driven at? Think I need to re visit growmau video again!

 

[2Stoned2Care]

page 6.. if you put 2.8a in you need 39volts

That makes no sense to me either because i have 4 1212s driven at 1400a by an hlg-185h-1400b and according to the specs they would need 37v each so 4x37=148v and the hlg-185h is rated 143v so my cobs should not even fire up but they work perfect

 

[Rapha El]

The resistance of the cobs doesn't change (enough to be noteworthy for this) but you want to push more current through. To do that you need more voltage Link

@2Stoned2Care my hlg 120 is rated for 148v max but can push up to 175v without hitting the overvoltage shutdown. Yours can push a max of 170v.
Same for my setup. I'm also over the recommended max load when I crank them up fully. If I wanted to play it safe I'd have to stay at ~800ma.

 

[2Stoned2Care]

The resistance of the cobs doesn't change (enough to be noteworthy for this) but you want to push more current through. To do that you need more voltage Link

@2Stoned2Care my hlg 120 is rated for 148v max but can push up to 175v without hitting the overvoltage shutdown. Yours can push a max of 170v.
Same for my setup. I'm also over the recommended max load when I crank them up fully. If I wanted to play it safe I'd have to stay at ~800ma.

Cheers for that info now it makes total sense

 

[wayward1]

Just seen pre drilled 133 X 70 heat sinks on ebay UK if anyone is still looking.

 

[XxxAuto]

Just seen pre drilled 133 X 70 heat sinks on ebay UK if anyone is still looking.

That would be better with a link