I've been using Cree XP-E series LEDs as strobes in my model RC aircraft for some years now. Because of the very short duration of the 'on' mode I've been using them without heatsinks with no problems. Running them off 5v supply I've been using series resistors ranging from 2 ohms to 5.6 ohms, depending on colour of course. In theory the wattage of the resistor should be around 1.5W to 2.0W, but in an effort to reduce package size, I'm wondering how low I can go in wattage without risking damaging any components, including the SMD 08M2 and transistor in the controller.
So my question really boils down to, if I use standard 1/2 watt smd resistors, if they can't handle the wattage will they fail open-circuit, thus avoiding any damage elsewhere?
So my question really boils down to, if I use standard 1/2 watt smd resistors, if they can't handle the wattage will they fail open-circuit, thus avoiding any damage elsewhere?