Hey guys,

Returning newbie with a question about some differing results I get with resistor calculators. The values I'm using are Vs (3.7V), Vf (3.4V), and a current of 1A (1000mA). When plugging these into various calculators I get these results:

ohmslawcalculator.com (.5ohm 3.2W)
led.linear1.org (1ohm 2W)
saber shop calculator (.3ohm .3W) which the .3ohm 1W is recommended as the closest they sell in the shop

So my question is are these merely coming up with different values based on commonly available sized resistors or am I missing something here? The large discrepancy with the wattage has me confused. I just ordered some new resistors from the shop for my tri cree (BBW) and a 5mm blue accent led. I went with the .3 ohm 1 W for the blues, a 1ohm 2W for the white, and an 18 ohm .25W for the accent. The math really should be pretty straight forward but now I'm wondering if I did something wrong in my selections. I just want to make sure I've got the right parts prior to going through with the build.