Need help on what resistor I need to use?
- Thread starter Randy555
- Start date
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f22shift
Flashlight Enthusiast
You're gonna notice that running an emitter at a low voltage at hundreds of mA is gonna be a LOT of heat for a resistor, the little 1/4W stuff you buy in huge packs won't do it. So look at the wattage of what resistor you need- this is really inefficient too. I suppose for an "emergency light" it could be ok to be inefficient. The world went to switching power supplies for a reason, you can get 12v ones from Kaidomain or Dealextreme sometimes.
Gunner12
Flashaholic
A driver would be much more efficient and would provide longer runtime.
From what I understand:
Resistors burn off the extra power as heat.
A perfect driver driving a 1 watt LED at 3.7v from a 12v source will take in 1 watt of power. Add in the resistant of internal components and you should be seeing around 1.2-1.5 watt from the source.
From what I understand:
Resistors burn off the extra power as heat.
A perfect driver driving a 1 watt LED at 3.7v from a 12v source will take in 1 watt of power. Add in the resistant of internal components and you should be seeing around 1.2-1.5 watt from the source.
