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Optimum design for a number of different LED configurations and average battery voltages is given in the following table. The last column gives the resistance values needed in the circuit for the approach chosen. Graph F1, F1a , F2, F3, F3a, F3b, F3c, F3d, F4, F4a, F4b are available.

GraphCircuit NameType Driver# of CellsBattery Voltage# of LEDsR ohms
F11S-1P-6W-206 W-20 X-mass bulbs4-AA4.8153.0
F11S-1P-CC15Const current 15 ma4-AA4.8182.0
F11S-1P-R160Series Resistor4-AA4.81160.0
F22S-1P-6-W-206 W-20 X-mass bulbs8-AA9.6253.0
F22S-1P-CC15Const current 16 ma8-AA9.6282.0
F22S-1P-R320Series Resistor8-AA9.62320.0
F33S-1P-10W-2010 W-20 X-mass bulbs6 Lead12.5385.7
F33S-1P-CC15Const current 15 ma6-Lead12.5382.0
F33S-1P-R270Series Resistor6-Lead12.53270.0
F3a3S-2P-12-D-3512 D-35 X-mass bulbs6-Lead12.5676.0
F3a3S-2P-2-W-202 W-20 X-mass bulbs6-Lead12.5618.4
F3a3S-2P-3-W-203 W-20 X-mass bulbs6-Lead12.5625.7
F3a3S-2P-CC20Const current 20 ma6-Lead12.5662.0
F3a3S-2P-CC30Const current 30 ma6-Lead12.5641.4
F3a3S-2P-R130Series R=1306-Lead12.56130.0
F3b3S-4P-3-D-353 D-35 X-mass bulbs6-Lead12.51217.8
F3b3S-4P-4-T-504 T-50 X-mass bulbs6-Lead12.51211.0
F3b3S-4P-CC40Const current 40 ma6-Lead12.51231.0
F3b3S-4P-CC60Const current 60 ma6-Lead12.51221.0
F3b3S-4P-R67Series Resistor6-Lead12.51267.3
F3c3S-6P-4-W-354 W-35 X-mass bulbs6-Lead12.51816.0
F3c3S-6P-5-W-50W5 W-50w X-mass bulbs6-Lead12.5188.7
F3c3S-6P-CC60Const current 60 ma6-Lead12.51820.5
F3c3S-6P-CC90Const current 90 ma6-Lead12.51813.7
F3c3S-6P-R44.7Series Resistor6-Lead12.51844.7
F3d3S-7P-3-W-353 W-35 X-mass bulbs6-Lead12.5217.2
F3d3S-7P-4-W-354 W-35 X-mass bulbs6-Lead12.52112.6
F3d3S-7P-CC84Const current 846-Lead12.52115.2
F3d3S-7P-R39.9Series Resistor6-Lead12.52139.9
F44S-1P-3W-203 W-20 X-mass bulbs6-Lead12.5424.3
F44S-1P-4W-204 W-20 X-mass bulbs6-Lead12.5433.7
F44S-1P-5W-205 W-20 X-mass bulbs6-Lead12.5444.7
F44S-1P-CC14Const current 15 ma6-Lead12.5482.0
F44S-1P-R110Series Resistor6-Lead12.54110.0
F4a4S-2P-1-W-201 W-20 X-mass bulbs6-Lead12.588.1
F4a4S-2P-4-G-504 G-50 X-mass bulbs6-Lead12.5817.2
F4a4S-2P-8-G-508 G-50 X-mass bulbs6-Lead12.5831.0
F4a4S-2P-CC30Const current 15 ma6-Lead12.5841.0
F4a4S-2P-R56Series Resistor6-Lead12.5856.0
F4b4S-4P-2-D-352 D-35 X-mass bulbs6-Lead12.51633.0
F4b4S-4P-2-G-502 G-50 X-mass bulbs6-Lead12.5167.5
F4b4S-4P-2-T-502 T-50 X-mass bulbs6-Lead12.5165.3
F4b4S-4P-3-T-503 T-50 X-mass bulbs6-Lead12.5168.0
F4b4S-4P-R40Series Resistor6-Lead12.51640.0

4S-4P in the above table stands for 4 LEDs are connected in Series and there are 4 parallel connected sets of the 4 series LEDs. This results in a total of 16 LEDs. 2-W-20 stands for a quantity of 2 of the W-20 type X-mass tree bulbs. W stands for Wal-Mart and 20 is the number of bulbs in the original string.

Offered by Mike.

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