what kind of resistor do i need?

[rdogg07]

i'm gonna get some blue LEDs to change my hvac lights.

Model: WLED-5B-02
Wavelength: 460-470nm
Vf: 3.0-3.4
V Service Life: Up to 100,000 hours
Emission Materials: Saphhire
Polarity: + Long Pin ; - Short Pin
Color: Blue
Radiation: no
Iv: 3000--4000mcd
Size of Lamp: 5.0 mm Dia x 9.0 mm

how many ohms and watts resistor should i use??

 

[jimwross]

330ohm

 

[weshole]

Try yhis link hope it works for you. http://.linear1.org/ckts/led.php