5 hours runtime using single AAA? Which LED?
- Thread starter delight
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PhotonBoy
Flashlight Enthusiast
They booth look very nice, but I'm acctually looking for a single LED so that I can build my own flashlight
LEDninja
Flashlight Enthusiast
The SSC-P4 will work. You need a driver <120 mA in and <30 mA out.
For smaller 5 mm style LEDs The Nichia GS or the SMJLED can be used.
For smaller 5 mm style LEDs The Nichia GS or the SMJLED can be used.
I guess the question is rather "How much power can I run the LED at when getting 5 hours from a single AAA?"
Let's say you will run it of an 800 mAh NIMH. That gives you 1.2*800=960mWh of power from the battery. Which means 960/5=192 mW for 5 hours.
You will need a step up converter. Lets say 70% efficiency which gives you 192*70%=134 mW of power to the LED.
If one estimates the LED needing 3.2V at that power it will draw 134/3.2=42mA
What LED? Pick any. No bigger difference between LED at 40 mA than at 350 or 700 mA.
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Let's say you will run it of an 800 mAh NIMH. That gives you 1.2*800=960mWh of power from the battery. Which means 960/5=192 mW for 5 hours.
You will need a step up converter. Lets say 70% efficiency which gives you 192*70%=134 mW of power to the LED.
If one estimates the LED needing 3.2V at that power it will draw 134/3.2=42mA
What LED? Pick any. No bigger difference between LED at 40 mA than at 350 or 700 mA.
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