I tested a U2 last night, latest model, at 161 lumens. SF claims 100
Is it measered from the same distance?
Couldn't have said that any better :nana:Integrating spheres are designed to achieve homogenous distribution of optical radiation by means of multiple Lambertian reflections at the sphere's inner surface.
The U2 is still one of my favorite SF models, even after years of buying, selling & using many lights more costly than the U2. Because of the "turbo" head, beam distribution is beautiful. And the range of output is broad. On top of all that, the UI is dead simple - twist the collar to go either brighter or dimmer.been after a U2 for a few years. I might look into buying one now.
Couldn't agree more, most ****fire overrate their lumens, they mark the "maximum possible lumens achievable by the led itself" but not the lightyes HDS is very honest. its only the Chinese companies that artificially inflate lumen ratings.
Not necessarily. And the beam profiles of these two are very different, so it's tough to compare them in anything other than an integrating sphere.Thanks.
I guess that means a SF LX2 rated to 200 lumens , probably will output more light than a RA Clicky also rated to 200 lumens , because Surfire underplay there lumens claims , and HDS do not.
Thanks.
I guess that means a SF LX2 rated to 200 lumens , probably will output more light than a RA Clicky also rated to 200 lumens , because Surfire underplay there lumens claims , and HDS do not.
There is a difference between lumen and lux. Lumen measure the total light output whereas lux represents the intensity of the light of the hot spot falling on a surface area. A laser has a very intense lux number but is impractical as an illumination tool. A flood light has a very low lux but it makes a very good illumination device for general close up application. It all depends on what you want your light to do.
Surefire uses a TIR lens instead of a reflector in the LX2. The TIR lens helps focus all the light forward for maximum throw and has very minimal side spill. While the LX2's narrow beam profile is still useable for close up applications, I much prefer the more floody HDS 200 lumen rotary for 90% of the times when I needed a light, because most of the time when I needed light it would be for up close usage. I find both HDS and Surefire to compliment each other very well.
So, lumen alone does not tell you how bright the light would be for a certain application. Knowing the light's intensity and beam profile is more important.