lightningbug said:Posters usually will note the distance from the light to the target background in their post.
There is no set distance, but I think most of us prefer to shoot beam photos @ 1 meter or less.
For throw examples, most pictures are taken outdoors and the distances vary wildly.
Somy Nex said:just my humble opinion but the methodologies for lux, lumens, and "light units" are there, and if you want an absolute comparison, those are the best units to use, even though there are flaws and difficulties associated with them, particularly the latter two. Even something as scientifically defined (and you'd think, "straightforward") as lux and lumens requires calibration and specific methodologies to be used to be comparable to one another.
so, with so many different factors surrounding beamshots, you can't really make beamshots comparable across the board for everyone, as there are differences in actual sensitivities between different brands of cameras and films, and even between models of the same camera using different CCD sensors (most of us use digital now). ISO 80 on one camera may be equivalent to ISO120 on another, or whatever (just an example). then there's also shutter and aperture speeds, and distance from target and other external factors such as the lux lottery and the scenario used for the beamshot (white wall & small room vs. large open area & green leaves vs. ???), and blah blah blah.
at best, you can standardize among your own beamshots, and hope one of the lights you own is one which the person seeking information also owns or has a question about. but in essence, that's really about it.
Lips said:Just list the info.
PhotoShop is a PITA!
Manual Mode 9ft
Laser for centering Vent in Ceiling
ISO 100 1/13 sec F3.2