Originally Posted by
spooky3369
Can some one please help me double check my computation for the RESISTOR.
I'm planning to make a rebuild, instead of having one LED I'll be using Tri Cree XP-E2 CopperNova - Blue/Blue/White for FoC effect. I'm thinking of putting resistors for each of the LEDs.
Main Power source is 7.4v Li-ion 2600mAh 18650
Tri-Cree Details:
Blue Cree Part# XPEBBL-L1-0000-00301
45.7 Minimum Luminous Flux @ 350mA
Forward Voltage @1000mA = 3.47v
White Cree Part# XPEBWT-L1-0000-00F51
266 Minimum Luminous Flux @ 1000mA
Forward Voltage @1000mA = 3.15v
Computation:
BLUE LED:
Power:7.4v - 3.47v = 3.93v
Resistor: 3.93v / 350mA = 11.22 ohm with 1.37 watts
WHITE LED:
Power: 7.4v - 3.15v = 4.25v
Resistor: 4.25v / 1000mA = 4.25ohm with 4.25 watts
I was also wondering if I would just put 1 resistor (more powerful) for the 2 BLUE LEDs? I'm open to better suggestions, thank you!
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