question about L2D and TK10

[White_Shadow]

i read on fenix's website they use the same led, but the TK10 give out 45 more lumens. so if you double the voltage you only get 45 more lumens?

 

[Marduke]

The voltage of the power source has nothing to do with brightness. The circuit in the light determines what current is sent to the LED, which is what determines brightness.

 

[White_Shadow]

The voltage of the power source has nothing to do with brightness. The circuit in the light determines what current is sent to the LED, which is what determines brightness.

then what does voltage give? more runtime?

no0b here, still learning....

 

[Marduke]

voltage doesn't give runtime, the stored "watt hours" of your batteries is what determines runtime.

I highly suggest you read the Welcome Mat.

 

[Gunner12]

A battery just stores a certain amount of total energy. A 1.5v 2000 mAh battery has the same watt hour as a 3v 1000 mAh battery(both are 3 watt hours, voltage x capacity = watt hours). But since a white LED usually runs at 3.5-3.7v, neither of those batteries will power the LED correctly so there is a circuit to raise the voltage to the right level(actually 3V should light up the LED, usable but not that bright, 6v would fry the LED). Since it is harder to raise 1.5v to 3.6v then 3v to 3.6v, the 3v powered light would probably have a slightly longer runtime. There are also circuits to lower the votlage like the ones in the P3D, T1, TK10, and TK11s. These circuits also ususally control the current going to the LED and thus setting the output. The 1.5v powered light can be brighter then the 3v battery powered one, at a shorter runtime of course.

To asnwer your queston simply, more voltage does nothing because of the different circuits in the lights. The output is more determined by the driver then the voltage of the battery.

 

[White_Shadow]

A battery just stores a certain amount of total energy. A 1.5v 2000 mAh battery has the same watt hour as a 3v 1000 mAh battery(both are 3 watt hours, voltage x capacity = watt hours). But since a white LED usually runs at 3.5-3.7v, neither of those batteries will power the LED correctly so there is a circuit to raise the voltage to the right level(actually 3V should light up the LED, usable but not that bright, 6v would fry the LED). Since it is harder to raise 1.5v to 3.6v then 3v to 3.6v, the 3v powered light would probably have a slightly longer runtime. There are also circuits to lower the votlage like the ones in the P3D, T1, TK10, and TK11s. These circuits also ususally control the current going to the LED and thus setting the output. The 1.5v powered light can be brighter then the 3v battery powered one, at a shorter runtime of course.

To asnwer your queston simply, more voltage does nothing because of the different circuits in the lights. The output is more determined by the driver then the voltage of the battery.

ahhh, i am just a young padawan, the force is strong with this one....