The only cheap and safe Chinese reseller that I know of that makes it cost effective to return merchandise within the US is DX. They can usually price match their competition and refund, exchange or credit broken or returned merchandise. If the merchandise is broken, they will pay up to 1/3rd the cost of the item to return it to their US location.
If DX carried this light and the reviews were good, I wouldn't hesitate to buy it. Unfortunately, I seriously doubt it could do well on only 3 x 18650's.
The best way to do a beamshot comparison would be to take a side-by-side photo with manual exposure stopped down until the hotspots do not saturate.
When you use auto-exposure like that, the camera will try to expose such that stuff in the flood area is not too dark, which results in the hotspot saturating the sensor (which have limited dynamic range compared to human eyes) so it's impossible to tell which is brighter.
I have to add to this that i had that Trustfire SST-50 ordered from lightake.com. It measured only about 3000lux in my lightbox. As comparison my Mag85 reads about 5300lux and WF-1300L is around 5000lux
So it won't go near 1300lumen. Also tailcap reading was 1.8 - 2.0A
Nope. Lux is simply a measure of the quantity of energy on a given area. 1 lux is 1 lumen per square metre. It is not distance dependent, hence a throw measurement is a number of lux at a given distance.
In a lightbox where the intent is to integrate all the output, you get a number of lux which is the "averaged out" number of lumens per square metre under those conditions.
If the box is calibrated to absolute units then you can read lumens directly off the integrating device. This is harder than it seems.
Nope. Lux is simply a measure of the quantity of energy on a given area. 1 lux is 1 lumen per square metre. It is not distance dependent, hence a throw measurement is a number of lux at a given distance.
The implication here is that we're only comparing lux at a consistent distance. http://budgetlightforum.cz.cc/node/694#comment-12685
I would certainly hope juhi measured them at the same distance.
Another variable is that these light meters are said to be calibrated to be most sensitive and accurate in the 4200K range. The higher up the scale you go, the less sensitive and more inaccurate the readings become. If all the test subjects had the same tint, you could do direct comparisons.
are said to be calibrated to be most sensitive and accurate in the 4200K range
The SI base units of candela/lumen/lux are "luminous" instead of "radiant", which means they are all calibrated to the human eye. So if a light meter is indeed a "lux" meter, it should presumably weight more or less against the spectral response of the photopic luminosity function, which if we need to translate looks to be best approximated by about a 5000-6000K black body (sun is closer to 6kK).
However, the cree/led white output is actually not much like the black body function at all. I didn't bother with graphing it, but it looks like the typical 6000K+ cree gives up significant chunks of red/yellow to fill in the blue part of the photopic function. Probably worth it for something approaching mesopic vision, but makes colors look crap as usual.
BOB were selling it for $47, so i odered one, but got a email today:
My apology that due to a disruption in the production line, the factory is unable to confirm the availability of the product you have ordered. 1 x TrustFire X6 5mode Luminus SST-90 LED Aluminum Flashlight (E54037) =$47.00
In view of your situation, please advise if we can offer you a refund of the item(s) or if you want to change to something else.
Kindly email us again if you need further assistance.
Regards, Yuan Customer Support www.BestOfferBuy.com
Its the Chinglish way of saying they screwed up and cant sell it at that price without losing their shirts. In the U.S., we call it "lying". That would have been a slick deal if the sale went through.
