livingaboard
Banned
- Joined
- Dec 31, 2005
- Messages
- 65
I am curios what you knowledgeable flashaholics believe as far as which makes of lights are known to be full of crap when they advertise their high lumen count?
Complete crap? Umm, eBayers yes. Many of the budget companies don't seem to show lumen ratings. Better companies might show bulb lumen, which can be 20-35% less after you include optical looses.
I think Novatac, RA lights, Pelican, Streamlight, Some Fenix lights(Looking at the tested lumen figures vs stated), and a few more state out the front lumen.
I am aware about this, but don't understand it. Even a single uncoated glass has only around 5% light loss, and a high reflection mirror only a single% or so. Where does the rest of the light disappear?
A high quality binocular can have more than 90% light transmission, and that with several lenses and prisms. The light losses of a flashlight (1 mirror and 1 glass) ought to be much less than a binocular.
Regards, Patric
There are then companies who pull numbers out of their arse with no rhyme or reason, or choose "peak lumens" which the light only attains for a grand total of maybe 5 minutes. eBay sellers and LedLenser come to mind
I am aware about this, but don't understand it. Even a single uncoated glass has only around 5% light loss, and a high reflection mirror only a single% or so. Where does the rest of the light disappear?
A high quality binocular can have more than 90% light transmission, and that with several lenses and prisms. The light losses of a flashlight (1 mirror and 1 glass) ought to be much less than a binocular.
Regards, Patric
Complete crap? Umm, eBayers yes. Many of the budget companies don't seem to show lumen ratings. Better companies might show bulb lumen, which can be 20-35% less after you include optical looses.
I think Novatac, RA lights, Pelican, Streamlight, Some Fenix lights(Looking at the tested lumen figures vs stated), and a few more state out the front lumen.