GarageBoy
Flashlight Enthusiast
DB917 pulling 400ma from a R123, meaning it\'s DD?
If a Downboy 917 only draws 420mA, it's running in direct drive, correct?
If a Downboy 917 only draws 420mA, it's running in direct drive, correct?
DB917 pulling 400ma from a R123, meaning it's DD?
- Thread starter GarageBoy
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xpitxbullx
Flashlight Enthusiast
Re: DB917 pulling 400ma from a R123, meaning it\'s DD?
I believe once the voltage to the downboy is lower than the vF of the emmiter then it goes into direct drive.
Jeff
I believe once the voltage to the downboy is lower than the vF of the emmiter then it goes into direct drive.
Jeff
GarageBoy
Flashlight Enthusiast
Re: DB917 pulling 400ma from a R123, meaning it\'s DD?
Hmm, that's odd...
The PRT was still very bright when the ammeter read 400mA with a single R123, but with two relatively fresh CR123s, it read 8xx
Hmm, that's odd...
The PRT was still very bright when the ammeter read 400mA with a single R123, but with two relatively fresh CR123s, it read 8xx
tvodrd
*Flashaholic* ,
Re: DB917 pulling 400ma from a R123, meaning it\'s
Going from 400mA to 800ma on a LuxIII will not "double" it's visable output. In fact, the LS is way more efficient at lower power. At higher drive power a much greater percentage is lost as heat. 400mA is a nice and very practical drive level for small lights. /ubbthreads/images/graemlins/smile.gif (Yes, "hotrodding" can be fun too! /ubbthreads/images/graemlins/grin.gif )
Larry
Going from 400mA to 800ma on a LuxIII will not "double" it's visable output. In fact, the LS is way more efficient at lower power. At higher drive power a much greater percentage is lost as heat. 400mA is a nice and very practical drive level for small lights. /ubbthreads/images/graemlins/smile.gif (Yes, "hotrodding" can be fun too! /ubbthreads/images/graemlins/grin.gif )
Larry
GarageBoy
Flashlight Enthusiast
Re: DB917 pulling 400ma from a R123, meaning it\'s
Thanks! I already have a hotrod minimag with a NG750. Hoping to go aleph 1 + NG500 to toast my KL1
Thanks! I already have a hotrod minimag with a NG750. Hoping to go aleph 1 + NG500 to toast my KL1
wasBlinded
Flashlight Enthusiast
Re: DB917 pulling 400ma from a R123, meaning it\'s
One of my favorite "practical" combos is a DB500 with a T??H emitter. With a Pila 168S, this light will run for 2.5 hours in regulation, and with an R123 I would guess you would get at least an hour.
You might ask, why not just use a Wiz2 if I want to use a rechargeable Li-Ion? Well the Downboy is very stable on low (through the McE2S resistor), while a Wiz2 is likely to flicker a bit, and I suspect the Downboy is also more efficient.
One of my favorite "practical" combos is a DB500 with a T??H emitter. With a Pila 168S, this light will run for 2.5 hours in regulation, and with an R123 I would guess you would get at least an hour.
You might ask, why not just use a Wiz2 if I want to use a rechargeable Li-Ion? Well the Downboy is very stable on low (through the McE2S resistor), while a Wiz2 is likely to flicker a bit, and I suspect the Downboy is also more efficient.
GarageBoy
Flashlight Enthusiast
Re: DB917 pulling 400ma from a R123, meaning it\'s
Thanks, I really wanna be able to throw in a normal 123, though
Thanks, I really wanna be able to throw in a normal 123, though
