It was laying in a parts box for several years, overlooked and forgotten.
It's the Nite-Ize 1 watt 2-6 cell replacement bulb.
I got useful light from it with a 9 volt that wouldn't light up a PakLite, and now it's 30 hours into running down an old Duracell AAA with corrosion coming out the Neg end.
I'm just using a large paperclip for the circuit, bent to a ring on one end for the bulb to press fit into, the rest of the wire formed like a question mark, nothing special. It fits about every primary battery I can think of, and if you wired two of them in series you could run them off a 12v.
As small and light as the bulbs are (4.4 grams, 5.4 with wire), I'm getting a second one for 12v compatibility and dropping them both in my general purpose kit.
It's the Nite-Ize 1 watt 2-6 cell replacement bulb.
I got useful light from it with a 9 volt that wouldn't light up a PakLite, and now it's 30 hours into running down an old Duracell AAA with corrosion coming out the Neg end.
I'm just using a large paperclip for the circuit, bent to a ring on one end for the bulb to press fit into, the rest of the wire formed like a question mark, nothing special. It fits about every primary battery I can think of, and if you wired two of them in series you could run them off a 12v.
As small and light as the bulbs are (4.4 grams, 5.4 with wire), I'm getting a second one for 12v compatibility and dropping them both in my general purpose kit.