Home     Contact     Forum     Projects     Experiments     Circuits     Theory     BLOG     PIC Tutorials     Time for Science     RSS     Terms of services     Privacy policy  
   
 Home     Forum     Projects     Experiments     Circuits     Theory     BLOG     PIC Tutorials     Time for Science   

Author Topic: Cree 10w  (Read 4378 times)

0 Members and 1 Guest are viewing this topic.

vimal

  • Newbie
  • *
  • Posts: 8
Re: Cree 10w
« Reply #15 on: February 12, 2015, 21:22:34 PM »
Hello friends. i am in the process of making the circuit but i am a bit confused. i took a look at the seller's led specifications.

http://www.ebay.com/itm/New-Top-10W-Cree-Single-Die-XM-L-LED-T6-White-20mm-Star-Base-1040Lm-3000mA-/221240243864?hash=item3382f23698


the seller states that the led operating voltage is 3.2v to 3.7v. can you please advise me on the voltage i need to use?

the led is rated 3A and 10w. i think for a maximum output, 3.4v is good since 3A x 3.4v gives me 10.2w.

please help.

thanks

cheerio

  • Sr. Member
  • ****
  • Posts: 306
Re: Cree 10w
« Reply #16 on: February 12, 2015, 22:06:34 PM »
Well it is the operating voltage range. Don't worry if you are not exceeding it. Just make sure the LED is cooled enough

kam

  • Administrator
  • Hero Member
  • *****
  • Posts: 1849
Re: Cree 10w
« Reply #17 on: February 13, 2015, 23:10:37 PM »
Actually you need a controller at 3A constant current. Let the controller decide what voltage to use for 3A. When the led is cold, the voltage required is higher. As it gets hot, the voltage must go lower. So you need a constant CURRENT supply.