Hi all
can someone please clarify:
question 1.
sometimes I use led's in car/bike applications and always use a 1 ohm resistor in series else the led fries , now i know these leds are 3.7 volt but the cars system is +-12 volt.
so what does the resistor do , reduce the voltage or reduce the amperage ?
Question2
Im planning to build a high power (5W) flashlight. I have ordered the 5w led and a driver board (buck) that has a input of voltage of 3 - 18 v , im also planning to use 3 x 18650's in series (11.1v) , now this driver board limits the amperage to 1000mA but the specs on the led are 6-7 v forward voltage and 1000mA , I would like to know how the driver board knows / inputs the correct voltage for the specific led ?
----> i want to do the same but using a 3w led ( 3w, 3.7 volt, 750 mA)
thanks
can someone please clarify:
question 1.
sometimes I use led's in car/bike applications and always use a 1 ohm resistor in series else the led fries , now i know these leds are 3.7 volt but the cars system is +-12 volt.
so what does the resistor do , reduce the voltage or reduce the amperage ?
Question2
Im planning to build a high power (5W) flashlight. I have ordered the 5w led and a driver board (buck) that has a input of voltage of 3 - 18 v , im also planning to use 3 x 18650's in series (11.1v) , now this driver board limits the amperage to 1000mA but the specs on the led are 6-7 v forward voltage and 1000mA , I would like to know how the driver board knows / inputs the correct voltage for the specific led ?
----> i want to do the same but using a 3w led ( 3w, 3.7 volt, 750 mA)
thanks