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.
I must first apologise to everyone for not telling about Trustfire x6 deal for $47. The farce that happened with the Solarorce SS for $23 at BOB and no-one got it. I wanted to go under the radar to see if they will ship it, but got an email stating that I cannot have due to production problems. I did not reply to this email and got shippiong conformation email today
I'm not to sure what they are sending, I'll have to wait.
lose the music and Speak what you are doing with what in the video's that you make - nobody is gonna give you grief about what you are Speaking about whatever you are showing or how you speak here take a look a my suddenly famous video - at least for me I had no idea !!! that there would be such a HUNGRY audience for this video
This is why you buy from DX or another distributor that will pay for return shipping on broken merchandise. Its also another stark reminder of the potential abysmal QC practices that we've seen in most Chinese lights of all price ranges. So when you ask your distributor several times if he pays for return shipping on failed items and he ignores your questions, flip him the bird and purchase from someone that does. Also, DX will almost always price match their competition and has the best support forum of the bunch.
I'm amazed that there are pratically no QC even with this light which cost almost $160!
I can understand that if you buy a $5 light you can't expect so much. But this thing? Come on, it's just a robbery.
Practically all of my "china" light's have been somehow broken or need of some fixing. None of them has a "quality" short of speak even with the more expensive ones.
I'm also getting tired of this constant poor customer service and quality.
My other hobby is all kind's of electronic gadget's and computers.
I bought recently a tablet computer from euogo.com. It was said to be one of the best china tablet's today. I got it few weeks after and it was unusable. It had very poor touch screen which made it pratically impossible to use. Also the battery life was 2h with WiFi use. I tried to ask some help and maybe a refund or return but they ignored me completely. Several email's after they answered something completely stupid as "have you tried to lower screen brightness or make a screen calibration". Yes, i can assure you that i have!
That thing cost's $170.
That's when i decided to never buy a nothing more expensive than a few buck's light from chinese and with a strong consideration.