Well, technically it isn't my "first" build. That was a Home depot special that I was rather proud of back in the day. And my second was an MR Mace Windu Conversion. But this is my first LED saber from scratch.

I hope I calculated my resistors correctly. I have watched so many videos and read so many posts and websites about Ohm's law my head is swimming.

My electronics:
Green/Green/White Cree XP-E2 CopperNova
Green: 1000mA = 3.7v
White: 1000mA = 3.15v
Li-Ion 18650 3.7V (rounded up to 4v)

Green
R = (4 - 3.7)/1 ----> 0.3/1 ----> 0.3 ohm
P = 0.3 x 1^2 ----> 0.3 w

White
R = (4 - 3.15)/1 ----> 0.85/1 ----> 0.85 ohm
P = 0.85 x 1^2 ----> 0.85 w

Am I doing that right?

For the green, I was going to use the .3ohm 1w resistor, but one of the tutorial videos by Rob, he said he always goes with a 3w resistor so I opted for the .5ohm 3w on each green LED.

Does the white FoC even need a resistor since it is only ever on momentarily? If i stick with always using a 3w resistor, would a 1.2ohm 3w work?