Relative Throw Measures on LSH-P/LSHF-P/Arc4+

I gathered three LSH-P's, two LSHF-P's, and my new Arc4+, and did relative lux measurements with LM631 meter. I used the same battery on each one, keeping the light on only for about 10 seconds, so the readings should be accurate for comparison. NOTE: these were not taken at 1 meter, but closer (but all at exactly the same distance), so these are not objective lux measurements, but only measure the lights relative to each other.

# 1853 LSHP 750 lux
# 881 LSHP 870 lux
# 1181 LSHP 1048 lux
# 1464 LSHF-P 1029 lux
# 1577 LSHF-P 1055 lux
Level 4 Arc4+ 1045 lux
Level 3 Arc4+ 1269 lux
Level 1 Arc4+ 1963 lux
Surefire L4 1380 lux

I guess I forgot to do level 2--too late now.

If Peter can do this with a 1 watt Luxeon on one cell, the possibilities for the Arc5 are awesome!

carmel

Hello Carmel,

Do you remember the distance you used for these measurments?

Tom

Great work carmel!

The ARC4+ is awesome! /ubbthreads/images/graemlins/huh.gif

Thanks

Twenty Four and a half inches. But beware of trying to convert them to one meter lux readings, because I deliberately did not use a new battery, but rather an old Lisun that was partically drained (it had a no load reading of 3 volts), in order to give an "average use" reading. I'm sure the lux readings would have been higher had I used a new battery. (actually, the L4 had fresh batteries!)

carmel

Peter states:

At setting 1, I am measuring about twice the lux at 1 meter of the Arc4+ over the LSHF-P.

The beam pic of the LSHF vs the LSH-P on the website was not done at 1 meter. At 1 meter, I am getting about 300Lux from the LSHF-P.

Jarhead,

Then it looks like my measurements are pretty good. . .

carmel

Which would mean about 600 lux at 1 meter.

My understanding is the the inverse ratio factor at 24.5 inches is about 2.52; so I think that would mean that each of my values should be divided by 2.52, to give lux at 1 meter. But again, the battery was partically drained, so I think the values are still low.

carmel

600~700 lux at 1 meter is reasonable, I think. Here is my measurement result.

As usual, please do not assume these values are accurate and universal. There are a lot of error factors and these values are taken with MY lights (you can see much variance among LSHP in the carmel's original post).

***EDIT***
I took these measurements without removing the lens protector film. Removing the film will increase the output a little and the lux reading at the brightest setting will exceed 700 lux.

wow, what an awesome comparison!