Strange with Sunwayman's effective range

jh333233

Flashlight Enthusiast
Joined
Oct 5, 2010
Messages
1,163
Location
Hong Kong
After comparing my SWM T20CS and V20C
Ive found such thing

First, V20C suppose to be floodier than T20CS due to size of reflector
And T20CS allows user to use turbo mode with 658lm while V20C maxed at 438lm

Now lets go the pic


T20CS box mentioned 278m @ 658lm while V20C says 300m @ 438lm
And they claimed that 2 tests are with same SWM's standard, FL1 standard stated on box

This is bizzare due to the spec
T20CS suppose to out-throw V20C with its over 10k lux while V20C is aprox. 6k lux

Btw, suppose Lux varies as inverse of distance square, i.e.
Lux <>< K/m^2 ,k is non-zero
Assume T20CS has 0.25 lux @ 278m
then i should have (lux@1m / 0.25)= (278/1)^2
Isnt it? Result in 20k lux@1m
Any thoughts?
 
Last edited:

yliu

Enlightened
Joined
Apr 10, 2011
Messages
584
Location
Hungary
I think it's just that some manufacturers, have inaccurate datas. If I remember correctly, Sunwayman also had a mistake with the T20C's runtimes.
 

peterharvey73

Flashlight Enthusiast
Joined
Apr 12, 2011
Messages
1,005
The 438 and 658 lumens claim seems to be ANSI FL-1 standards.
Ditto the 278 meters claim for the T20CS.
However, I suspect there is a printing error for the 300 meters; Selfbuilt tested the V20C's throw at 155 meters - same with it's competitor, the Jetbeam RRT-21.
One way to be sure is to email Sunwayman, and ask them if the 300 meter claim is for real, or a printing error???
 
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