Power needed for led lights?

[stuee]

Hi,
I have just purchased these
**broken link removed**

i have also purchased these 2

**broken link removed** - 1w blue
**broken link removed** - 3w cool white

I would like to put 2 3w white and 2 1w blue on these. What power supply would i need to do this.
I do have a few 240 > 12v 6amp power supplies from extra rgb strip lights spare i would like to use.
If i know what each pad is i can work out how many pads i can run per power supply.

thanks

 

[audioguru]

How will you cool those No-Name-Brand tiny LEDs? They must be mounted some-how on some kind of heatsink.
The datasheet will show how to do it but there is no datasheet.

You must design a circuit for the LEDs that limits their current or they will instantly blow up.

 

[stuee]

Hi.
They will be mounted onto the aluminium heatsink in the first link then i will put them all them onto an alu strip. i understand the limit circuit thing, im guessing i just treat these then like normal leds with forward current and use resistors where necessary. My main question i suppose is to find out if i have to do anything different being power leds as opposed to the standard 3mm leds.

 

[audioguru]

The first link shows a small piece of thin aluminum only 28mm in diameter. It cannot dissipate 4W or 12W. It is used to hold the surface-mounted LEDs.

An aluminum strip makes a lousy heatsink. A REAL heatsink has many fins for a large surface area close to the item needing cooling.

Current-limiting resistors must be selected for each LED since the forward voltage of each LED is different (3.2V to 3.6V). The resistors will get VERY hot.