led driver for a 30w led i dont want to pay the 30 bucks for one, i need to know how to use it without the driver?

do i need the led driver for a 30w led i dont want to pay the 30 bucks for one, i need to know how to use it without the driver?


heres the led


http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160418184744

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antonbergjr (author)  RavingMadStudios7 years ago
No, as I said, you need a 0.66 Ohm resistor.....or 30 USD
antonbergjr (author)  steveastrouk7 years ago
antonbergjr (author)  RavingMadStudios7 years ago
i know but i dont know what resister to use for the led
As Steve has already mentioned, the formula for calculating resistance is in Step 2 of the Instructable linked above. Good luck!
antonbergjr (author)  RavingMadStudios7 years ago
i am having trouble can someone just post a link on ebay of a cheap one from china or somthing thanks?
Why not try ? 
www.ebay.com

...making your own simple one would cost less than 5 USD.
Use a resistor in Raving's link, around 1.22/1.8 or 0.66 Ohms
antonbergjr (author)  steveastrouk7 years ago
i am having trouble can someone just post a link on ebay of a cheap one from china or somthing thanks?
Fuzzy3D7 years ago
Do what I did with my 10w, dig through your adapters and find one that'll give you close to those specs right off the bat. Most importantly is not to go too far over the recommended current. And make sure you use a beefy heat sink WITH A FAN!