It should be possible, with no new technology, to put together a small battery, a printed circuit and an LED into a package that would make a small disk that would flash for several days. The back of the disk could either be adhesive or have a thumb tack point that could be pushed into a bulletin board to draw special attention to a notice or used by inspectors at a site to call attention to a specific point of interest or by people moving into unknown territory that would blaze a trail for others to follow even in the dark. It probably would also be useful in military situations. I don't know if an ultra-violet LED is possible, but if so, special eyeglasses would make the mark visible only to those selected to see it. Infra-red might also be useful.
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UV is possible, but AFAIK energy innefficient.
You can use high eefiecincy red, possibly infrared LEDs and a lithium cell, if not a couple AAs.
Such devices are readily available, although you've come up with some interesting new uses for them. I got a blinking LED disc at a bar on Mardis Gras -- it had a badge-type pin on the back and a transparent plastic Skyy Vodka logo on the front. Your ideas seem more practical than advertising vodka though...
Such devices are readily available, although you've come up with some interesting new uses for them. I got a blinking LED disc at a bar on Mardis Gras -- it had a badge-type pin on the back and a transparent plastic Skyy Vodka logo on the front. Your ideas seem more practical than advertising vodka though...