LED light is efficient but you need to calculate the resistor value and wattage to put in line.
The current limiting resistor is used so the the LED puts out light but does not overheat given a voltage.
My favorite web calculator is the following:
http://ledcalc.com
The current limiting resistor is used so the the LED puts out light but does not overheat given a voltage.
My favorite web calculator is the following:
http://ledcalc.com