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Forward voltage Typical lumens Target mA 3.6/3.7v 4.5/4.8v 6v 7.2v 9v 12v
White Lux III 3.9 80 1000 N/A 1 Ohm 2 Watt 2.2 Ohm 5 Watt 3.9 Ohm 5 Watt 5.6 Ohm 10 Watt 8.2 Ohm 8.2 Watt
White K2 3.85 140 1500 N/A 1 Ohm 5 Watt 1.5 Ohm 5 Watt 2.7 Ohm 10 Watt 3.9 Ohm 10 Watt 5.6 Ohm 12.6 Watt
Blue Lux III 3.9 30 1000 N/A 1 Ohm 2 Watt 2.2 Ohm 5 Watt 3.9 Ohm 5 Watt 5.6 Ohm 10 Watt 8.2 Ohm 8.2 Watt
Blue Lux V 6.84 48 700 N/A N/A N/A 1 Ohm 2 Watt 3.3 Ohm 5 Watt 8.2 Ohm 4 Watt
Blue K2 3.85 46 1500 N/A 1 Ohm 5 Watt 1.5 Ohm 5 Watt 2.7 Ohm 10 Watt 3.9 Ohm 10 Watt 5.6 Ohm 12.6 Watt
Amber Lux III 2.95 110 1400 1 Ohm 2 Watt 1.2 Ohm 3 Watt 2.2 Ohm 5 Watt 3.3 Ohm 10 Watt 4.7 Ohm 10 Watt 6.8 Ohm 13.3 Watt
Red Lux III 2.95 140 1400 1 Ohm 2 Watt 1.2 Ohm 3 Watt 2.2 Ohm 5 Watt 3.3 Ohm 10 Watt 4.7 Ohm 10 Watt 6.8 Ohm 13.3 Watt
Royal Blue Lux III 3.9 450Mw 1000 N/A 1 Ohm 2 Watt 2.2 Ohm 5 Watt 3.9 Ohm 5 Watt 5.6 Ohm 10 Watt 8.2 Ohm 8.2 Watt
Royal Blue Lux V 6.84 700Mw 700 N/A N/A N/A 1 Ohm 2 Watt 3.3 Ohm 5 Watt 8.2 Ohm 4 Watt
Royal Blue K2 3.85 750Mw 1500 N/A 1 Ohm 5 Watt 1.5 Ohm 5 Watt 2.7 Ohm 10 Watt 3.9 Ohm 10 Watt 5.6 Ohm 12.6 Watt
Red-Orange Lux III 2.95 190 1400 1 Ohm 2 Watt 1.2 Ohm 3 Watt 2.2 Ohm 5 Watt 3.3 Ohm 10 Watt 4.7 Ohm 10 Watt 6.8 Ohm 13.3 Watt
Green Lux III 3.9 80 1000 N/A 1 Ohm 2 Watt 2.2 Ohm 5 Watt 3.9 Ohm 5 Watt 5.6 Ohm 10 Watt 8.2 Ohm 8.2 Watt
Green Lux V 6.84 160 700 N/A N/A N/A 1 Ohm 2 Watt 3.3 Ohm 5 Watt 8.2 Ohm 4 Watt
Green K2 3.85 130 1500 N/A 1 Ohm 5 Watt 1.5 Ohm 5 Watt 2.7 Ohm 10 Watt 3.9 Ohm 10 Watt 5.6 Ohm 12.6 Watt
Cyan Lux III 3.9 80 1000 N/A 1 Ohm 2 Watt 2.2 Ohm 5 Watt 3.9 Ohm 5 Watt 5.6 Ohm 10 Watt 8.2 Ohm 8.2 Watt
Cyan Lux V 6.84 160 700 N/A N/A N/A 1 Ohm 2 Watt 3.3 Ohm 5 Watt 8.2 Ohm 4 Watt
Cyan K2 3.85 105-130 1500 N/A 1 Ohm 5 Watt 1.5 Ohm 5 Watt 2.7 Ohm 10 Watt 3.9 Ohm 10 Watt 5.6 Ohm 12.6 Watt
AccLED1 2 Not Rated 20 82 Ohm 1/4 Watt 150 Ohm 1/4 Watt 220 Ohm 1/4 Watt 270 Ohm 1/4 Watt 390 Ohm 1/4 Watt 560 Ohm 1/4 Watt
AccLED2 2 Not Rated 20 82 Ohm 1/4 Watt 150 Ohm 1/4 Watt 220 Ohm 1/4 Watt 270 Ohm 1/4 Watt 390 Ohm 1/4 Watt 560 Ohm 1/4 Watt
There are many different versions of the K2 LED's. The figure's shown are for the ones offered here.
The lumens shown in red are the brightest in that color. This should not be the only basis for which led to use, there are other things to consider such as price and voltage required.
It is better to use a higher wattage rated resistor than required, but never use a resistor at less than 25% of its rated power.
The resistors listed above are the recommended or better wattage rated resistor for each specific voltage/LED combination.