LED resistor value calculation

LED TYPE LED COLOUR NUMBER OF
LEDs IN SERIES
SUPPLY
VOLTAGE
RESISTOR
VALUE

Standard:

Superbright:

Ultrabright:

Red,Yellow, Amber,Green:

White OR Blue:

Nominal battery voltages are :

NIMH 6x NIMH = 7.2 volts 7x NIMH = 8.4 volts 10x NIMH = 12 volts 12x NIMH = 14.4 volts LIPO 1 cell = 3.7 volts 2 cell = 7.4 volts 3 cell = 11.1 volts 4 cell = 14.8 volts

Standard resistor values E12 Series (5%):

These are the standard available resistor valuse. Choose the higher value closest to the value calculated above. 47 , 56, 68, 82, 100, 120, 150, 180, 220, 270, 330, 390, 470, 560, 680, 820, 1000 ohms

LED Connections

Do not connect without an appropriate resistor. The resistor may go either side of the diode.