Need information about these kind of high power leds.

[Johanx2]

Hi guys. I am in the process of making a led bar lamp that uses these high power leds (10w each!). By the way, they do cost around $1 each one, very cheap!
I need to know if these leds do need a resistor in series, or if I should connect it directly to the 12V. They do work with 12V, but I have no information about if they do need a resistor, just like all the regular leds. Thanks.

**broken link removed**

Here I put the specs

- LED Emitter: 10W

- Output Lumens: 900 Lumens

- DC Forward Voltage (VF) :9-12 V DC

- DC Forward Currect (IF) : 900mA

- Color Temp: 5500 ~6200K (CoolWhite)

- Beam Angle: 140 degrees

- LifeSpan Time : > 50,000 hours

 

[betwixt]

They need a resistor or even better, constant current source. If you connect 12V directly across them they will almost certainly die very quickly!

Brian.