help on that driver choose

Hello everyone, I need help, I look for the right driver for this LED
http://cutter.com.au/proddetail.php?prod=cut1447

I have a battery pack 12volt
I recommended that drivers
Thank You

you need linear LDO (low dropout driver ) with 3 A + , similar to that http://www.candlepowerforums.com/vb...stable-10A-linear-LED-driver-New-and-Improved (with different black resistor )

lucca brassi said:

you need linear LDO (low dropout driver ) with 3 A + , similar to that http://www.candlepowerforums.com/vb...stable-10A-linear-LED-driver-New-and-Improved (with different black resistor )

Click to expand...

excuse me but tell me best are not so experienced, I did not understand that I have to use voltage, I also have this driver can I use it or do you burn everything
https://pcb-components.de/led-aufwa...d-senser-xtreme-200-2050ma-6v-30v-detail.html

One you linked is boost, LEDs must need more voltage than battery supplies. It will not work for you. You have more battery voltage (12V) than LEDs (3 XM-L at 3A will be about 10.5V).
If you ok with just one level you may use this (order 3000mA)
https://pcb-components.de/led-abwaertswandler-buck-step-down/micro-2800ma-5v-28v-detail.html

Also you can use one Lucca pointed. It is linear, in short it means battery voltage should be only little bigger than LEDs, which in your setup will be ok.

You may also look at TaskLed drivers, LFlex and b3Flex will be good for your setup. They have more features.
http://www.taskled.com/lflex.shtml
http://www.taskled.com/b3flex.shtml


Are you in Germany or near and is easier for you to order from there?

When is ratio voltage input : output = 1: 1 , are switching regulators in some undefined area, also the efficiency is not so good. That's why they use mixed type buck/boost driver which is also called sepic driver .

At pcb components is one kind of that type driver http://pcb-components.de/led-auf-ab...-up/1-cell-200ma-1000ma-2-5v-5-5v-detail.html where 1 cell Lion battery with 3,7 V drives 1 white led vith also with 3,7V voltage drop (but only 1000mA ). While battery during run depletes , changing potential , also led resistance varies depending on the temperature , driver try to compensate all that variations with constant current.

@lidas : I would ask pcb_components how effcient would be driver in your case and how will work ( if there would be some troubles ) , in other case I would go with standard buck driver and 1 cell more in batery pack or linear driver if i'll stay with 12V batery pack.

Then I have to replace a lamp powered 12v with those three LEDs that I showed you on the first post, by following your instructions I took this driver
https://pcb-components.de/led-abwaertswandler-buck-step-down/micro-2800ma-5v-28v-detail.html
I hope I do not have the wrong
thank you

That driver should work.

What kind of battery pack are you using? If it's a 10-cell NiMH pack, then it's actually about 15V right off the charger and about 10V when it needs to be recharged. That should work well with the driver and LED you picked. You might start to see the light dimming when the batteries are running low, but that's probably a good thing.