Perfect white led???

[Dreck]

On my last visit to Target, I purchased a visor mounted CD holder which came with a free led keychain light. I assume it's a PRC product but the strange thing is...it produces a PERFECT round spot that is PERFECTLY white! No blue, no hotspots, no rings, no green just a perfect circle of white light! It actually makes my LE look bad by comparision, not to mention my Inova Microlight which has about the worst white led I have ever seen. The little bugger is about an inch-and-half long with a chrome-plated oval die cast housing in which a clear plastic center section that houses the usual pair of 2016's and a remarkably tactile feeling switch. If any of you get a chance to visit your local Target store...check one of these out. The batteries are also replacable with the help of a really tiny Phillips screwdriver. All I know is the one I have has the most perfectly round white spot of any led I have seen. Does anyone know of these? Had I a camera I would take some beamshots.

 

[paulr]

They may just have the LED behind a round hole, makes a perfectly circular beam by throwing away part of the light. Photon "covert" models probably are also like that (I haven't tried one).

 

[Dreck]

The led is exposed, and there is no shroud of any kind. Could it be a Nichia? The beam is focused with the led only.

 

[chamenos]

is the led frosted? covering the led on my arc AAA with some scotch satin tape usually produces a very smooth white light with no artifacts or colour abnormalities /ubbthreads/images/graemlins/smile.gif