Bob at RMSK has no patience and just can not wait for actual test results. The optic in the new LOGAN
flashlight has a Candela input to output ratio of 29.58 to 1, and the measured bare bulb output of the XP-G R5 at
one amp of drive current is 78 Candela. That gives a theoretical output of about 2300 Candela. The new
K2 flashlight ratio is 47.92 to 1 for a 3700 Candela output and the Night Patrol 300 is 72.50 to 1. Output would
then be approximately 5600 Candela for the NP300s. He may have gotten the the approximate outputs
mixed up, that is my fault for not sending him a hard copy.
A quick bench test with the Logan optics gives these initial results with a more accurate test to follow later.
50 mA drive to the XP-G R5 is 150 Candela output.
100 mA @ 303
200 mA @ 536
350 mA @ 915
500 mA @ 1247
750 mA @ 1677
1000 mA @ 2070
A posting in the LED sub-forum on the Cree XP-G R5 in bare bulb, gave the following results:
40 mA 16.70 Lumens @ .11 watt
60 mA 25.81 Lumens @ .16 watt
100 mA 43.65 Lumens @ .28 watt
200 mA 86.16 Lumens @ .58 watt
350 mA 145.37 Lumens @ 1.05 watts
500 mA 200.03 Lumens @ 1.55 watts
700 mA 265.31 Lumens @ 2.22 watts
1000 mA 351.09 Lumens @ 3.26 watts
The Logan in the #8 power level will use a buck-boost circuit to drive the LED at 1 amp current. The Light is
the same size as the original McKinley light with the seven 5 mm LEDs. That light output was 190, (HP),
or 240, (SP), Candela. The new Logan will use either the CR123A Lithium battery or the RCR123A, (16340),
Lithium-Ion rechargeable battery. There is also a 2 x AA battery compartment.
I hope this clears up any misunderstanding about this light.
The moderators may want to move this thread to the Peak sub-forum area as not to break any forum rules by my response.
Curt
