Originally Posted by
JWLaRue
I would appreciate it if someone could check my calculations for the power resistors for a NBv3 and Tri-CREE LED combination! I used the guidance in the NBv3 manual and am assuming the same wiring set-up as Count Voodoo's diagram.
LEDs: two royal blue with a forward voltage of 3.41v @1000mA and one white with a forward voltage of 3.15v @1000mA.
Battery: 18650 (?)
Calculations:
royal blue LED resistor = (3.7 - 3.41) / 1.0A = 0.29 ohms
resistor wattage = (3.7 - 3.41) * 1.0A = 0.29 watts
white LED resistor = (3.7 - 3.15) / 1.0A = 0.549 ohms
resistor wattage = (3.7 - 3.15) * 1.0A = 0.55 watts
-thanks, guys!
Jeff
Bookmarks