I recently came across a finding I don't understand: 100mw power dissipation for a (4) LED circuit. I don't have a problem with the power value itself (100mw) but the recommendation to go with 1 Watt power instead of 1/2w or even 1/8w. Should the rating be changed from 1mw resistor to something else? My understand is that the maximum power per resistor should not exceed Power x 2, for example .04 x 2 = .08( < .25) is covered by resistor with .25power and up.
|Number of LEDs||4|
|Supply voltage, Vs||5V|
|LED forward voltage, Vf||1.25V|
|LED forward current, If||20mA|
|Individual Diode Power Dissipation||25mW|
|Total Diode Power Dissipation||100mW|
|Recommended Resistor Wattage||1 Watt Resistors|