I came across this beam shot from a flashlight called Bushnell HD flashlight
it produces a very smooth and sharp square beam. I am curious what optics they use to produce such a distinct beam. I know about aspheric lenses and that they can project the image of the emitter but the result is not the same. The manufacturer say they use Luxeon Rebel LED and a patented optics technology but I wasn’t able to find out what is different about their patented technology. Do they use more than an aspheric lens to product such a tight and sharp beam? Does anyone own one and taken it apart?
it is like they used a almost zoomed light, extended the bezel so no more rings or edge discolorations can be seen.
interested how it actually works so subbed.
i mean, as long as we are all GUESSING about it? Its not like we cant get square lenses (as opposed to the more normal round ones) from surplus shed… they have some square lenses, they exist, they are not complete unobtainium.
then, a company that big could get just the square lens they want made up in plastic cheap in bulk. I figure get JUST the right lens square, and pass thru a square aperture…?
at one time a ways back? There was a series of gun scopes that were square”ish”… wider field of view, i think they called it the “TV”-something gun scope?
I don’t know what’s patented about the optics, but I guess there’s is just basic condensor lens/projection lens optics in that flashlight, exactly as it is done in a slide projector (the hollow mirror is not needed when a led is used instead of a filament bulb), with the square aperture in place of the slide:
It gives a nice even illuminiation (like a projector needs to do) but the two-element system takes up some flashlight length.
I know that with right selection of condenser lenses you can lets say have giant XP-G2 projection (same or bigger than lets say mtg2 classic beam under aspheric) but then you have to sacrifice maximum lux potential. For example XPG2S4 in B158 throws 340 kcd (without condenser) but with mentioned condenser lenses it will do about 180-200kcd with giant main beam projection.
So downside of this would be maximum lux performance drop and very poor flood mode.
I first saw this light abut 5 years ago from a Bushnell ad in a LEO magazine. The ad expressed the easy of a squared pattern check with out the issue of a hot spot or round profile. Seems like it was pointed towards crime scene search.
I’d like to see some beam shots at range for these. The ‘newer’ model claims 300 lumens. And the vids of the early model seem to show it isn’t just a short distance light.
The idea of an evenly illuminated area has it’s own appeal, even if it sacrifices total output.
I agree with you… That why I prefer aspheric zoomy over them anytime… I don’t find useful spill in reflector lights so useful as other guys cause spill causes reflection from environment and nearby objects. Your pupil of the eye narrows and you see less. The brighter the environment is, the narrower is the pupil of the eye, so there’s a reduction in light that hits the fundus.
About best zoomie on the market. B158 without condenser lenses does about 150-200 lumens in hotspot and around 700-800 lumens in flood.
Full flood mode of this light covers field of view about 40 meters on 50 meters distance(which is about maximum pleasant viewing distance when in full flood mode).
