If anyone is having a Zebralight SC600 (CW), an Ultrafire T50 or a 47's mini CR2 for sale please contact me via PM or mail.
I'm also interested in buying some cheap used Luxmeter.
I don't care in which condition the devices are, they should just be working reliable.
you can buy this one new for $13.41. I have one and am very happy with it. Made several different lightboxes for it and it works great.
wow, that's cheap - anybody else w/ comments on that meter?
So can I measure both output Lumen and the intensity in Lux with that device?
No, you can only measure (up to 50,000) lux but you can estimate lumens with a regression formula. I just got a new light and will post some readings and how to do this soon.
P.S. Now the meter's only $13.20 
Is there a "Lumen meter" then or do you guys always do maths when saying how much output a flashlight gives?
Light integration spheres are required to measure lumens and they cost thousands of dollars. Only large testing companies have them for the most part.
People make “light boxes” to try to get around this limitation. I don’t know how well they work but might work OK in a relative manner (comparing two lights for example).
Other than measuring many people just use the emitter data sheet and measure current and estimate output.
I posted a plot of reported lumens versus measured lux for my lights w/the luxmeter mounted in my shoebox lightbox here: